iPhone 11 can’t see SIM card

What to do if the Internet does not work on iPhone while roaming

Go to Settings → Cellular and see if the slider next to Cellular is enabled. 2. If you are abroad, check if the data roaming settings are active (Settings → Cellular → Data Options → Data Roaming).

iphone, card

Keep in mind that the cost of mobile data roaming is much higher.

These simple methods in some cases will help you avoid going to the service center and save a decent amount, which could be invoiced by not clean on hand specialists.

DFU mode

Service mode activated when the smartphone is connected to the computer. In the corresponding program, you must perform a certain sequence of actions and the system will independently install the current firmware, eliminate configuration problems or service errors.

Important! However, care must be taken with the firmware settings. Incorrect actions can cause the state of the smartphone “brick”.

When eliminating the defect on your own, you should not use methods that require complex surgical intervention or opening the device case. If self-repair did not give results, it is recommended to contact a qualified technician.

How to unlock an operator. ways

At the moment, there are two known ways to “unlock” the iPhone.

The R-SIM is a small chip that fits into the iPhone and unlocks the radio. Without going into technical details, it is important to note that this method is hardware-based, rather complicated, and, importantly, unofficial. This raises a number of problems:

  • Interruptions to services such as iMessage and FaceTime
  • Unlocking is reset to zero after a reboot or iOS update, and the device cannot be restored via iTunes
  • Communication problems
  • You may be denied warranty service in Russia

You don’t have to resort to the laborious R-SIM method to unlock your iPhone. There is an option that will provide permanent unlocking. To do this, write to the operator to which your iPhone is “tied”.

It is not at all necessary to do this yourself, there are a large number of companies engaged in the “unlock” of smartphones. But it is important to know 2 points: this procedure is not quick (from a day or longer) and not at all cheap (up to several tens of thousands of rubles). You should not contact those who offer to “unlock” the iPhone quickly and cheaply. they are scammers.

SIM card replacement.

If none of the tips above helped you, then it is worth trying to insert another SIM card, for example, your friend or relative. Maybe your carat is faulty and the thing is in her name, and not in the phone. Insert the card into the tray, if the “No SIM card” error disappeared and everything works fine, then the reason is in your SIM card. Instead of visiting those. For support in the Apple Store, you should contact your carrier and ask to replace the SIM card for the iPhone. This process will not take much time, and most likely you will receive a new one instantly.

If the error persists, and you are sure that there is no physical damage, most likely the problem lies in the software of your iPhone.

What does “locked” mean and what are the signs

The term “locked” means that the iPhone is designed to work on a particular carrier’s network. The smartphone will not be able to interact with “foreign” SIM-cards, it simply “does not see” them. Most often we are talking about American carriers such as ATT, Verizon, Sprint or T-Mobile.

But, also in other countries there is a system for locking devices. iPhones that work with all carriers are called “SIM-free”. When buying, you should choose exactly this type of device.

The easiest way to determine if your iPhone is locked or not is to insert a SIM card and look at the top line of the iOS system. If the name of the operator is written there, then you have a “SIM-free” device.

Unfortunately, the attackers went further and with the help of a special tool (we will consider it below) they can temporarily remove the lock from the operator. After turning on the iPhone works and even sees the SIM, but as soon as you try to update and activate iOS, the iPhone will stop connecting to the network.

To check whether the smartphone is locked or not, you should go to the IMEI.info website and enter the IMEI of your device in the corresponding field. After that, the portal will show some information about the iPhone, including you can make a paid check for blocking by operator.

You can find IMEI by following the path: “Settings”. “General”. “About this device” or by entering the command “#” in the dialer.

Problems with firmware

The fact that the “apple” gadget does not see the SIM may be the result of an iOS software failure, due to which the firmware of the cellular modem has flown. It will not be possible to identify such a malfunction without having special equipment at hand. However, if the user tried to install several cards in the gadget and the device did not recognize any of them, there is no need to rush to the service center. First you need to try to change the firmware on the iPhone.

Use iTunes to replace the firmware. The user needs to connect the gadget to the PC, go to the device control menu (1) and click on the “Restore iPhone” button (2).

iTunes will download the latest official firmware itself and install it on your smartphone. If the user wants the iOS on his gadget to remain in the current version and not be updated, he should independently find the appropriate firmware on the Internet (IPSW file) and download it to the mobile device by pressing the “Restore” combination (in iTunes) Shift (on the keyboard ).

Incorrect connection

  • First of all, you should make sure that the SIM card is connected to the phone correctly. First, you need to open the SIM card tray using a special paper clip.

When the tray is removed from the device, pull out the SIM card. Reinstall it with the chip down. Also make sure the cut corner of the card aligns with the notch in the tray.

How to Fix No SIM Card, Invalid SIM, Or SIM Card Failure Error on iPhone

Read more: How to insert a SIM card into an iPhone

  • Press lightly on the SIM card until it fits snugly into the tray. Then replace the tray by pushing it in until it clicks into place. Turn on the screen and check if the operator is detected in the upper left corner of the screen.
  • Why iPhone can’t see SIM card

    If the smartphone stops finding the SIM card, the user is not always to blame. Even iPhones are prone to fail due to natural reasons (wear and tear on components) or due to factory defects. There are the most common malfunctions, justified by the features of the device itself and the principle of its operation.

    • hardware room. damage to components or their natural failure;
    • software. malfunctions of the operating system and its components, application conflict.

    Most often, you can solve the problems of the second group yourself, since often only restarting the iPhone is required to fix a malfunction. But it also happens that this is not enough.

    I hope our tips if the iPhone does not see the SIM card helped you. Before you panic and rush to the nearest service center, try the universal algorithm described above. In 85% of cases, these actions help to solve the problem without additional investment of time and money. The most important thing is accuracy and attentiveness. See you on the site pages!

    Old SIM

    Sims, like any devices, do not last forever. They can simply use up their resource and not contact the device. To make sure that the iPhone does not see the SIM card for this banal reason, ask a colleague or friend to insert a working nanosim into your smartphone. If the network appears, then you will have to contact your cellular provider to exchange the damaged SIM-card. Often, the iPhone does not read the SIM if it is often reinstalled on different devices or simply removed frequently. This deteriorates the contact tracks, over time, deep scratches appear on them, preventing good contact with the board.

    Card reader or antenna

    If the phone says that there is no SIM card, then the reason may lie in the antenna or card reader. Most often, the card reader or the print itself is damaged during careless installation or removal. Some people use hazardous tools at hand that can damage the fragile parts of the device. Contact petals can bend or even break. You have to change such elements or install a completely new connector.

    “Locked” sim card

    It may happen that you try to insert a SIM of a certain operator into the iPhone 5 or any other device, and the phone is set at the factory to work with a different network. In this case, numbers of other cellular operators are not supported. You can deal with this problem by contacting a good service center. Or on your own, but it’s risky, it’s very easy to ditch expensive electronics.

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    If the iPhone does not see the SIM card, we do it clearly according to the instructions.

    IPhone users often turn to the masters with the fact that the phone does not accept or does not see the SIM card. For devices of this popular brand, this problem is very common. Perhaps, in pursuit of the introduction of new innovations, developers systematically ignore such minor, in their opinion, shortcomings. In any case, users have to look for ways to solve this problem on their own. What to do? How to fix the breakage yourself? Who to contact for professional help?

    Drops and bumps, moisture ingress

    When the phone falls down, despite the absence of external chips and cracks, it is likely that there is internal damage. Sometimes the problem is localized in the SIM card slot. It can “move away” and the contacts will not touch the metal part of the SIM-card. You can try pulling out the slot (you need a special key or use a paper clip) and then push it back into the slot. Sometimes restarting the device helps. If the problem is not solved, then you will have to contact an experienced mobile repair technician. If the reason turns out to be the hit of the device in a humid environment, then you cannot do without a qualified master.

    Universal instruction

    If the iPhone refuses to see even a new SIM card or a message appears on the phone screen about an invalid SIM or not inserted microsim, try to perform the manipulations:

    • It is necessary to check that the cellular communication of the operator whose SIM card is inserted into the slot works well in the area where the gadget is located.
    • Try updating your iPhone to the most current version of iOS.
    • Use standard iOS functionality to put your phone in airplane mode. Then wait 10 seconds and turn off the flight mode.
    • Restart your iPhone. To do this, press and hold the Sleep / Wake button until the slider appears on the screen. Slide it to turn off the machine. Detailed instructions in the picture below.
    • Be sure to check if your operator’s settings have been updated. To do this, go to the “Settings” section, select “General”, and then click “About this device”. If an update is required, a message will appear on the smartphone screen asking you to click “OK” or “Update”. Click “Refresh”, after a while we restart the device again, the communication error will most likely go away.
    • Gently pull the SIM out of the holder and slide it back into the slot. Examine the gadget and make sure that the SIM slot is tightly closed. If you use a SIM card holder from another iPhone model or a completely different smartphone, then it may not fit in size.
    • Try using a different SIM card. If you do not have a backup option, then go to the communication salon and ask the employees to provide a SIM card on duty to check the device.
    • If after all the manipulations the message about the absence of a SIM card does not disappear, then contact Support Apple. The operator will tell you how to be in a situation when the iPhone stopped seeing the SIM card.

    Reasons for the failure

    The reason for the fact that your iPhone does not see the SIM card can be anything from system glitches to a burned-out module on the motherboard. But there is a list of the most common reasons, we will consider each of them in detail.

    Can’t see SIM card iPhone 11

    It is not uncommon for users to face a situation where the iPhone stops seeing the SIM card. A malfunction of the SIM-reader can be associated with various reasons, therefore, it is necessary to determine what caused the incorrect operation of the smartphone. An experienced technician will help you fix problems with your SIM card in a matter of minutes. If you do not see the iPhone 11 SIM card, then you should understand that the device is locked for a specific operator. So, problems with the operator’s card “Megafon” should be solved in the company salon. Operators of other operators in this case will not be able to help.

    Why is the SIM card icon missing on iPhone 11?

    If there is no SIM card icon on Apple smartphones, you need to check if your gadget is blocked for one cellular operator. Unlock will help to solve the problem. All the user needs to do is contact the service center. You should not try to interfere with the operation of the iPhone on your own, as this can lead to serious damage and additional repair costs. The most common reasons for iPhone 11 not seeing SIM card include:

    • The SIM card is out of date;
    • failure of the firmware;
    • failure of iPhone parts;
    • changing network settings;
    • incorrect installation of the reader.

    If the SIM is out of order, then you will need to change the module in the salon of the serving cellular operator. Often, the network in a smartphone is lost after the next update of the operating system. To restore network functionality, you must update iOS to the latest version. But this option is only suitable for those users who have backed up their data using the backup function. If this method does not help display the SIM card, then it is recommended to contact the service center.

    What to do if iPhone can’t see SIM card?

    If the device is damaged due to mechanical impact, then without opening it, it will be quite problematic to find the source of the malfunction. Antenna, contacts, card reader may fail due to falling, impact or squeezing. You cannot open the smartphone case on your own, as this can lead to more serious damage and higher financial costs. If the message “Invalid SIM” appears on the phone screen, then you need to do the following:

    • Make sure your cellular plan is activated.
    • Update your operating system to the latest version.
    • Restart iPhone 11.
    • Update your cellular operator settings. In the main settings, go to the “About this device” section and confirm the update offer.
    • Remove the SIM card from the slot and reinsert it. You can try to put another SIM-ku.

    After carrying out the diagnostics, the wizard will be able to accurately answer the question why the iPhone does not see the SIM card. Internal breakdowns require urgent repair, as they affect the operation of the entire device. Can’t see the iPhone 11 SIM card for no apparent reason? You need to check your network settings. If the problem is a failed settings, then you need to go to the section for resetting network settings. The iPhone will then be able to detect the card. You need to make sure that the SIM is installed correctly. To do this, just use a special key and pull the card out of the smartphone slot.

    If the special key has been lost, then you can take any sharp object. a needle, a paper clip. If you do not know where the slot is, then you should look for it on the right side of the case. If the phone does not see the SIM card, then you need to start by diagnosing the device itself. Do not waste time hoping that the malfunction will be eliminated on its own. Contact the service center urgently. An experienced technician will be able to quickly find the cause of a smartphone and SIM card malfunction.

    Professional repair

    If there are problems with the SIM-card and the phone has stopped seeing it, then it is quite problematic to find their cause on your own. The service center will help you repair broken SIM-reader mechanisms or fix problems with unsuccessful firmware. The service center uses modern equipment, programs and tools that allow you to repair your smartphone quickly and efficiently. If you are faced with the fact that the smartphone does not see the SIM-ku, then you can always contact our specialized company.

    We offer comprehensive iPhone diagnostics, high-quality repairs in a short time. Within 1-2 hours after handing over the gadget for verification, you can pick it up completely intact and with restored functions. To repair iPhone 11, just contact us in an affordable way and make an appointment for a diagnosis or consultation. We provide a full range of services for cleaning, repairing phones with a guarantee.

    Obsolete SIM card

    Another reason why the iPhone does not see the SIM card is the expiration of the life. Cards also do not last forever, over time they deteriorate. communication works worse, during calls you hear interference and scraps, and then the card simply stops working. In such cases, help will no longer work, you will have to change your SIM card. usually they don’t even take money for such a service, it is only important to provide the owner’s passport. The procedure takes 15 minutes and does not require any additional steps. If necessary, a new card will be cut to fit the size of the SIM slot, the service will cost 150 rubles. Although new cards are often sold with plastic adapters to adjust the size.

    Mechanical damage to the smartphone

    Change SIM

    The answer for those who are looking for why the iPhone does not read the SIM card and what to do in this case is to try changing the card in the device. Contact a friend who also has an iPhone with a working sim card and check if it will work in your device. Put your SIM card in another phone. if the card does not work, it will be replaced. If it works, then the problem is with the tray or the device itself. It is also worth contacting the mobile operator, sometimes the network disappears due to technical work on the mowing line.

    SIM locked

    Also, the iPhone does not see the SIM card if it is locked, that is, it is designed to work with the network of a certain operator. In this case, other networks will not be recognized / therefore it is worth buying only models marked “SIM-Free”. There are two ways to solve the problem with a locked SIM card:

    • use the R-SIM microchip (the method will lead to the loss of warranty, there are also problems with communication and Apple branded applications);
    • contact the operator for whose work the smartphone was created.
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    In the second case, you will have to be patient, but the unlocking will be “clean” and forever. It is also worth noting that you will have to pay several thousand rubles for the procedure. Only scammers perform such works quickly and cheaply.

    Reboot smartphone

    The first method that users resort to is to reboot the device. It has long been known that this procedure can solve three-quarters of iPhone problems. The fact is that under active loads, the operating system starts to “glitch”, and the smartphone. to give errors. This is normal, rebooting the device and cleaning up unnecessary debris will quickly improve the situation. Users regularly complain about pop-up errors, but the masters say that they will have to put up with it and do not forget to restart the smartphone. Buying Android will not solve the problem. such errors occur even more often.

    IPhone breakdown

    Here are just a few reasons that can lead to physical damage to the iPhone and the inability of the gadget to see the SIM card:

      Falling the device and other mechanical influences on it may cause damage to the SIM-reader mechanism. The use of a low-quality charger leads to a short circuit. The short circuit, in turn, causes burnout of diodes, resistors and other small components. Filling. It’s worth checking out the humidity sensor: on the iPhone 4, it is located in the headphone jacks and for charging, and on the latest devices, in the SIM slot. If you can clearly see a red dot, then the iPhone is a “drowned man”.

    If the user does not carefully insert the tray into the iPhone, it may cause a malfunction of the SIM card slot. There is only one way to eliminate such a breakdown. by completely replacing the slot.

    Whatever the reason for the iPhone malfunction, it is not recommended to disassemble the mobile device and try to solve the problem yourself. There is a risk of making it worse. Only specialists of service centers, who have professional equipment at their disposal, are able to accurately diagnose a breakdown and correctly eliminate it.

    You shouldn’t worry too much about finances: with the modern, exorbitant level of competition, service centers set fairly loyal for their services. Replacing the SIM slot, for example, will cost the iPhone owner 1.5-2 thousand rubles.

    Problems with firmware

    The fact that the “apple” gadget does not see the SIM may be the result of an iOS software failure, due to which the firmware of the cellular modem has flown. It will not be possible to identify such a malfunction without having special equipment at hand. However, if the user tried to install several cards in the gadget and the device did not recognize any of them, there is no need to rush to the service center. First you need to try to change the firmware on the iPhone.

    Use iTunes to replace the firmware. The user needs to connect the gadget to the PC, go to the device control menu (1) and click on the “Restore iPhone” button (2).

    iTunes will download the latest official firmware itself and install it on your smartphone. If the user wants the iOS on his gadget to remain in the current version and not be updated, he should independently find the appropriate firmware on the Internet (IPSW file) and download it to the mobile device by pressing the “Restore” combination (in iTunes) Shift (on the keyboard ).

    To replace the firmware, it is better to use the latest version of the iTunes media combine.

    If flashing didn’t fix the SIM problem, the iPhone is most likely broken.

    SIM card malfunction

    The most common reason why the iPhone does not see the SIM is because the SIM is not properly trimmed. Pruning is not that difficult. even an amateur armed with scissors can do the job. However, there is always a risk of touching the chip and thereby disabling the SIM. Salon employees who cut cards for money are also not able to guarantee that everything will go “like clockwork”.

    This may not only be due to incorrect cropping. SIM cards tend to demagnetize. that is, fail for no apparent reason. The iPhone’s refusal to recognize the SIM card is also caused by the fact that the card has an old-style chip. Nowadays, such chips are used extremely rarely, but no one is insured against a “meeting” with them.

    These are the SIM cards iPhone users have nothing to try to cut:

    How can you check if the SIM card is really the case? It’s very simple: take the card out of your phone and insert it into another device with a suitable SIM slot. If this device does not see the SIM card either, you need to go to the communication salon with your passport and ask the consultant to replace the card. The procedure is completely free; it will take no more than 5 minutes.

    After replacing the SIM, the numbers on the card will not remain. Therefore, before heading to the service office, it is worth copying contacts from iPhone to computer.

    If another device recognizes the card and does not experience any problems when working with it, the owner of the iPhone will be just right. it just won’t be possible to solve the problem.

    Why iPhone can’t see SIM card?

    If the iPhone does not see the SIM card, the owner of the gadget does not need to immediately “sprinkle ashes on his head”. first you should find out the reason. It is possible that the solution to this problem will take no more than a few minutes.

    Despite the fact that the iPhone is considered the most reliable mobile device, its owner is also not insured against breakdowns and expenses related to repairs. A common malfunction in recent years has become the refusal of “apple” smartphones to recognize SIM. On the screen of the iPhone, which stopped seeing the SIM card, a similar message appears:

    There are many possible reasons for this error. We will tell you about each of them and give recommendations on what to do to solve the problem.

    iPhone 11’s: SIM Card Not Working, No Service, Constantly Searching, No SIM (FIXED!)

    Availability of SIM-Lock on iPhone

    Most often iPhones are locked under SIM cards of ATT and Verizon operators.

    Of course, the best way to solve the problem with SIM-Lock is to return the device to an unscrupulous seller and then buy a gadget certified to work in Russia. However, most often sellers refuse to return, arguing that the smartphone is in good working order. after all, SIM-Lock is not a breakdown.

    There is no need to “hang up” when you find yourself with a “locked” iPhone in your hands. there are many solutions to this problem:

      Contacting the workshop. The service specialists will remove the SIM-Lock, but will demand an impressive amount for the work (from 100). The owner of the gadget should remember that after the “artisanal” removal of the “lock”, the iPhone loses its warranty. Do-it-yourself “unlock”. You can also try to unlock the iPhone yourself. there are a number of Internet services that allow you to do this (for example, IMEI-Server.ru). In this case, you will also have to spend money, but the amount will be much more digestible. Online services ask on average 2. 3 for help. Purchase of Turbo-SIM. Turbo-SIM is an adapter that is inserted into the tray along with a SIM card and unlocks the radio module when the iPhone is activated. The purchase of such an adapter will cost the user about 1.5-2 thousand rubles. Using Turbo-SIM can lead to a decrease in the quality of communication and problems when setting up iMessage, but of all the ways to get rid of SIM-Lock, this is perhaps the most effective. Contacting a telecom operator. The user is finally able to write a letter to the provider, under whose SIM-cards the iPhone is locked, and ask for an official unlock. This method has many disadvantages: firstly, the operator’s reaction will have to wait long enough, secondly, you need to write in English and preferably without the help of the “clumsy” Google Translate, and thirdly, you will also have to pay for the official unlock. (ATT) up to 15 thousand rubles (Finnish company DNA).

    The official “unlock” also has a significant advantage. it does not entail the loss of the warranty on the iPhone.

    The fact that the iPhone does not see the SIM card is almost always the result of carelessness or carelessness of the owner of the gadget. Even if the user has become a victim of an unscrupulous seller who “sold” a locked smartphone, he should only blame himself. he did not pay due attention to preliminary checking of an expensive device.

    Solving a problem is much more difficult than preventing it from occurring. and moreover, more expensive. If the iPhone does not see the SIM card because it is locked or broken, the user will definitely have to part with a certain amount of money in order to make the device work. It will be possible to fix the situation for free only if the problem lies in the SIM card.

    Main reasons

    The iPhone can malfunction with its active use, and there are a lot of reasons due to which there are malfunctions with the SIM. The list is quite impressive: starting with factory bugs and crashes, ending with a malfunction in the update. As practice shows, 90% of cases are external influences on a smartphone. The remaining 10% is due to software bugs or inaccurate use.

    What the masters usually reveal in service centers after falling into the hands of a “problem” device:

    • Falls and bumps. If it seems to you that by accidentally dropping your phone on a hard floor, you will get off at least with a scratch, and at most with a broken screen, then you are greatly mistaken. Bumps and falls may well affect the hardware, and not always with the SIM (this can be a Bluetooth or Wi-Fi module). So, if such a problem appears, try to remember how often and how long ago you dropped your device;
    • Ingress of moisture. No iPhone, even the latest model, is 100% water resistant. If the gadget has some kind of protection, then the device should not “float” for hours. sometimes it can already be written off. Old models are generally poorly protected from moisture. If water gets into the SIM card slot, then, unfortunately, you cannot do without visiting the service center;
    • Old sim card. Like any other thing, a chip card has a tendency to wear out, especially if you change iPhone models frequently and constantly rearrange it. The chip is erased over time, preventing mobile communication from working correctly, and sometimes it is difficult for a smartphone to read a SIM card;
    • Locked gadget. If you bought a gadget abroad or from hand, then it is quite possible to face the problem of a locked iPhone. What it is and what to do about it is written later in the article.
    • Update glitch. Incorrect installation of iOS or a jailbroken version of Jailbreak may well lead to this.
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    After identifying such a bug, the owners immediately panic, because repairs in a service center are expensive. In fact, according to statistics, users of apple products can do without the help of a master and special equipment. The most important thing is to understand the cause of the problem, and you will find instructions on how to solve it in the material of this article just below. Let’s dwell on each reason in more detail and offer a solution to the problem.

    Locked iPhone model

    The problem here is not in the SIM, but in the gadget itself. Many iPhone models that are offered to consumers at an attractively low price are in fact unofficially imported from overseas. Often users who do not understand the intricacies of smartphones fall for such a “bait”. A huge and significant drawback of such devices is the lack of a full manufacturer’s warranty. This is a lottery: someone is lucky that a smartphone brought from, say, the United States works flawlessly, while someone is tied to a local mobile operator Verizone or ATT and does not work with Russian.

    You can find out if the gadget is locked even before the purchase. Some services provide their services for free, others ask you to pay. To do this, you need to know the unique IMEI number indicated on the original box and in the settings of the device itself. And even here it cannot be guaranteed that the site will help to accurately determine the lockedness of the model.

    If the gadget has already fallen into the hands of the user in this state, then it is easy to determine whether the gadget is locked or not. When you try to insert a SIM card of any operator of the Russian Federation, the phone does not read it, refuses to work with it. There are several options for solving this problem:

    Settings glitches

    It often happens that completely new devices and models from Apple may not see the SIM card due to a normal system malfunction. We figure out how to reset the settings for the correct operation of mobile communications:

    • Reboot the device with the required keys, depending on the model;
    • Go to the “Settings” of your gadget;
    • Then go to the “Basic” tab;
    • Go to the “Reset” tab;
    • In the list that appears, select “Reset network settings” and confirm the action.

    This should help, since all knocked-down parameters should be calibrated as needed. The network settings will be reset to factory defaults, as if the user had turned on the device for the first time. Don’t worry, this action won’t affect photos or important documents.

    Old generation SIM

    It is a good habit to change your SIM card periodically (at least once every 5-7 years). These elements, unfortunately, have their own expiration date and after a while they use up their resource, ceasing to contact the iPhone. To make sure that the problem is in an outdated plastic carrier or natural wear and tear, it is enough to find a suitable SIM size (recall that for models 4. the size is standard, for 4S. a micro-SIM card, and for iPhones 5 and newer. used nano-SIM).

    Where does it come from? As practice shows, this will inevitably happen to those owners who often and inaccurately rearrange SIM-cards. Unfortunately, not a single model for the Russian market has yet a second SIM slot, therefore, this problem is encountered by users quite often. The contact tracks on the surface of the element are erased, wear out, small scratches appear that interfere with the normal operation of the contact and the board. The transmission of the mobile signal, at the same time, deteriorates.

    If the mobile connection has stopped working in the smartphone, then it is worth visiting the nearest cellular salon in order to replace the current SIM card and get a duplicate. Usually, replacing an old card with a new one is a free procedure, but it is better to check this issue with the employees of a local authorized salon. What are the advantages of getting a duplicate:

    • The money transferred to the account balance will not go anywhere and will be saved;
    • The phone number will be saved, which means that communication with friends and relatives will not be lost;
    • The selected tariff from the operator and services will also be preserved (which is very convenient, because tariff plans are constantly changed and removed, so that the user can always save a profitable package of options).

    A duplicate is much more profitable and more convenient than buying a new, clean number.

    If the SIM card is still not readable, then you will have to visit the service center for diagnostics. in most cases this procedure is provided free of charge. And if the iPhone is still under warranty, then there is a high probability that the matter is in a factory defect. Contact the place of purchase of the device, where workers are required to accept the device, check, repair or replace.

    Firmware malfunctions

    Finding out if the problem is in the current version of iOS, that it is the firmware that is the cause of the unreadable and non-working SIM card, is hard on your own. It is impossible to accurately diagnose, but it is still worth trying to reflash if there are no other options for provoking factors. In this method, there are two ways: roll back to a previous version or try updating to a fresh one. It’s up to you to decide what is best to take. Tip: if on the previous version of iOS the gadget worked properly and without errors, then it is better to return to the previous version.

    To carry out the flashing procedure, thereby solving the problem of software failure, you need a computer on macOS or Windows with the official iTunes utility installed. Further, the order of your actions is as follows:

    • Connect your device to your PC using the original USB cable. Wait until iTunes recognizes the connected gadget;
    • Find your iPhone icon in iTunes on the left side of the top bar;
    • Click on the “Restore” button. It can be found on the right side of the window;
    • The firmware will be installed in a few minutes;
    • Disconnect the device from the computer and check the functionality of the SIM card.

    Incorrect connection

    • First of all, you should make sure that the SIM card is connected to the phone correctly. First, you need to open the SIM card tray using a special paper clip.

    When the tray is removed from the device, pull out the SIM card. Reinstall it with the chip down. Also make sure the cut corner of the card aligns with the notch in the tray.

  • Press lightly on the SIM card until it fits snugly into the tray. Then replace the tray by pushing it in until it clicks into place. Turn on the screen and check if the operator is detected in the upper left corner of the screen.
  • Failure in network settings

    A failure in the network settings can occur both immediately after the start of using the iPhone, and after a while. To fix it, you must try to do a network settings reset.

      Open the parameters on your smartphone, and then go to the “Basic” section.

    Tap on the item “Reset network settings” and confirm the start of the process using the password code.

    SIM card malfunction

    Do not exclude the possibility that the problem is not in the iPhone at all, but in the card itself, which for some reason is out of order. You can check this using another phone: just connect a SIM card to it and check its performance. If you are convinced that the card is faulty, you will need to contact the nearest operator’s salon. As a rule, the procedure for replacing the SIM card is provided free of charge.

    What to do if iPhone can’t see SIM card

    Failure of the firmware

    If the phone still does not see the connected SIM card, it should be assumed that there is a serious software glitch in iOS. You can solve it by flashing the device.

    • Connect iPhone to your computer using a USB cable and then launch iTunes.
    • Put your smartphone in DFU mode. This mode is emergency and is used to solve problems in the operation of the device’s operating system.

    Read more: How to put iPhone into DFU mode
    If the iPhone input to DFU is correct, iTunes will report the connected device. Don’t worry if the screen displays the wrong color of your smartphone. Click on the “OK” button.

    Then iTunes will offer to restore the device. Start this process and wait for it to finish: first, the program will automatically download the latest version of iOS, and then proceed to installing the firmware.

    When a welcome window appears on the smartphone screen, activate the device and check if the cellular operator is detected.

    Phone malfunction

    If the iPhone appears to malfunction, the first thing to try is to restart the phone. Typically, this simple method will solve a communication problem successfully in most cases.