My mobile does not recognize SIM card: how to solve it step by step

When you change your mobile device, or when you change your SIM card, the terminal often does not recognize it. If you mobile does not recognize SIM card, It can be for several causes that must first be analyzed to know how to proceed to solve the problem. In this tutorial you will learn how to know the reason why the SIM does not work and the possible solutions.

So you will get out of one of the worst problems that can be had with this type of device, since without these cards you have neither a telephone line nor data, so you will be completely isolated.


Mobile does not detect SIM card

The most common is that the Android mobile or tablet shows a message on the screen warning that your mobile does not recognize the SIM card. This is done by error messages What:

  • No SIM card detected
  • No SIM card detected

In rare cases, Symptoms that indicate a problem with the SIM card They go from losing the numbers that are recorded in the memory of the card, to not having a line or mobile data.

Mobile does not recognize SIM card: possible solutions

mobile does not recognize sim card

Here are some of the possible causes and the solutions explained step by step so that you can solve the cases in which your mobile does not recognize SIM card:

You must follow these steps knowing well what you are doing or you could damage the mobile or the SIM card. Also, always do it by taking all precautions and backups to avoid accidents or losing data. On the other hand, it is necessary that you know where the SIM card is located in your mobile device, since each model and brand may be different.

Badly inserted card

One of the most frequent causes when you have changed your mobile or acquired a new SIM that is put in for the first time is not having placed it correctly. Although modern mobiles include slots in which it can only fit one way, it is possible that some models allow it to be inserted one way or another. To solve this problem:

  1. Turn off your cell phone.
  2. Look for the manual of your terminal and read the details of where and how to insert the SIM.
  3. Now check that it is properly inserted in the slot. And never force these elements, as it should enter without exerting pressure.
  4. If it was incorrectly placed, once it is correctly you can check that everything works normally.

SIM tray inserted incorrectly

Another reason why the mobile does not recognize SIM card is because you have not inserted the tray well. Modern mobiles use a card where the SIM (single or dual) and / or the microSD memory card usually go. When it is inserted, even if it has been done correctly, sometimes it does not insert all the way and that causes no contact. To resolve this bug:

  1. Switch off the mobile phone.
  2. Take out the card tray.
  3. Make sure that they have not come out of the socket and therefore cannot be inserted because they are colliding.
  4. Insert the tray all the way and make it flush with the frame of the mobile.
  5. Now check if it works.

Bad contact of the SIM card in the slot

Sometimes it is a simple matter of what the SIM card does not make contact well with the pads that the phone has. Usually it can be from dirt that has become embedded. All you have to do in this case is:

  1. Turn off your cell phone.
  2. Take the SIM card out of its slot.
  3. Check the gold contacts of the SIM and the mobile.
  4. You can blow or wipe the surface if you see dirt. Do it with a dry cloth, never with something damp.
  5. Insert the SIM again and see if the problem persists.

Defective SIM card

There is also the possibility that the SIM card is damaged. This happens when the card is too old and has passed from one mobile to another, deteriorating the gold contacts or due to a crack. If you see visual damage, the solution is to ask your technology provider to clone the card or ask for a new one.

Damaged slot

The other case is when the Android mobile phone slot or slot has been damaged and it no longer makes contact with the SIM card. This usually happens in old mobile devices, or in which the card has been removed and inserted very frequently. To check if this is the case, follow these steps:

  1. Switch off the mobile phone.
  2. Take out the SIM card inside.
  3. Correctly insert another SIM card that you have at your fingertips, from another mobile, prepaid, etc.
  4. Test if it detects that other card. If not, it will indicate that there is physical damage to the mobile.
  5. In these cases, it is either sent to the technical service for repair or it is replaced by another mobile.

Restart Android

Once all the possible physical problems have been checked in the previous steps, the next thing is to check other software glitches that may also be causing your mobile not to detect a SIM card. Sometimes, due to specific errors in the operating system, the SIM card is not being detected although everything is correct. To fix this, just reboot.

SIM card is disabled

One of the most frequent things is that SIM card is not active. To check:

  1. Contact your telephone service provider and certify that the SIM card has been activated. If it was an old card, this step will not be necessary.
  2. Then go to Android Settings.
  3. In the search engine type “SIM” and you will get several related options.
  4. Check in SIM Status that it is correct. Or in SIM cards and mobile networks.
  5. And in dice / call SIM, which is active. If it isn’t, press the enable switch.

The network is misconfigured

You may also your mobile network is wrongly configured and that causes the SIM to not be detected or appear to be undetected. To solve it:

  1. Go to your Android Settings.
  2. Then enter Mobile Networks (if you can’t find it, you can use the Settings search engine).
  3. If not enabled, enable the Automatically select a network option.
  4. Check if there is now a line.

Misconfigured network operator

It is also frequent in some new mobiles, contract changes, especially some Chinese brands, or after a major update of the operating system, that a inappropriate network operator for the area where you live. To solve this problem:

  1. Go to Settings on your Android.
  2. Then to Mobile networks.
  3. If the Network Operators option is available, find the right one and select yours.

Troubled APN settings

Another common problem that can have symptoms similar to when a mobile does not detect a SIM card is that the APN settings are incorrect. If you want to try to fix this problem, you will have to configure it manually:

  1. Go to your Android Settings (9.0 or higher).
  2. Use the search engine of this app and search for APN.
  3. Select the correct APN or click on New APN to proceed to enter the provider’s details. Of course, you will need to know them, so you will probably have to contact him.

Data cache issues

Oddly enough, some undetected SIM card issues have to do with data cache problems. To try to solve this problem, you must use the apps you have on Google Play to clear the data cache, or use the function of the system itself:

  1. Turn off your cell phone.
  2. Now simultaneously press the Volume + button and the power button. Hold down for a few seconds and you will see that the mobile restarts in Recovery Mode.
  3. Release the buttons and you can now use volume +/- to navigate the menu and select Wipe Cache Partition.
  4. To execute that option, once you have selected it, press the power button.
  5. Wait for the process to finish and the phone to restart. If it was a cache problem it will have been solved.

Last hope

In extreme cases, when none of the above works, try to make a backup or backup of your data, and then proceed to make a hard reset to leave the mobile as it came from the factory and try to see if it was a malicious app or other system problem that was causing this problem. For it:

  1. Turn off your Android mobile phone.
  2. Now press the Volume + button and the power button simultaneously. Hold down until Android Recovery Mode appears.
  3. Release the buttons and you can now use Volume +/- to navigate the menu to the Wipe data / Factory Reset entry.
  4. Once checked, press the power button to run. Wait for the process to finish and you will see that your mobile restarts as it came from the factory (you must configure, install all the apps, data …).