Clean SIM card and cell phone

The first thing we will have to do is clean the SIM card and the mobile socket as this is one of the most common reasons when our device does not recognize it, to do this we will have to remove the card and clean the gold contacts with a dry cloth. the same way, we need to clean the phone's slit with a soft chamois on the pins to remove any dirt.

Check if the SIM card or mobile phone socket is damaged

There may also be a card or slot failure. To check this, it would be interesting to insert the card into another terminal to see if it recognizes it. In the same way, we should test our terminal with another SIM card to see if it works properly. If the fault persists. found in our calling card itself, we need to request a duplicate from our operator. If the failure is in our phone slot, it may be a board failure, so we can put the folded card on the SIM card to improve contact. It may also happen that the gap is broken, in which case you will have no choice but to go through the technical service.

Is he well prepared?

One of the most common and fairly common errors is the simple fact that this card has not been properly inserted into the slot or tray because it is not seated properly, preventing a mobile device from recognizing it automatically. the tray also puts a microSD card, which may cause us to insert the card the wrong way, making it not working.

We will therefore have to check that both the card has been properly seated and that the tray it is in is correct as it may also happen that someone has inserted the tray upside down. not working, it will be your turn to skip to the possible solutions below, which we will explain below.

Turn off the mobile signal

Another option we can try is to deactivate the mobile signal in case there is a network problem. To do this we need to access the hidden menu labeled * # * 4636 # * # *. Once checked, a menu will appear in which we need to select "Device information" and then "Deactivate cellular signal". After this operation is performed, we wait a few minutes, activate it again and restart the device to check if it already recognizes our SIM card.

Set the network mode to Automatic

If we have the wrong network mode selected on our device, it may also be the main reason for our card detection failure. Therefore, it is recommended to set the network mode to Automatic to solve the problem. Activation route varies depending on the Android cell phone or iPhone. .

Reset the device to factory settings

Finally, if none of the above worked for us, we will have to proceed with restoring the device. Basically in this step we assume that all the data and configuration of the device would be completely wiped, that is, as if we left the smartphone as we first turned it on. Thus, it is possible to fix a software problem that can be solved in this way.Therefore, if you want to restore the system of your Android mobile or iPhone, you need to follow these steps: