Why can't Xiaomi 4c read the mobile phone card? What happened?

Hello, the mobile phone does not recognize the mobile phone card. Please first check whether the SIM card is installed correctly and is a standard card: please insert the correct standard card. For example, the main card slot of a telecom model generally only supports telecom cards. Please insert the correct size card. A card with an incorrect size may be inserted, but it cannot be recognized. Some models do not support hot plug, please restart the phone after inserting the SIM card.

If you insert the card correctly, use the standard card, restart the phone after inserting the card, and still can't recognize the SIM card, please try the following solutions:

The mobile phone turns on the flight mode by mistake, which leads to the error of not recognizing the card. Please turn off the flight mode.

Please go to settings > dual card management and check whether this SIM card is not enabled. If so, please enable this SIM card.

Please try to insert this SIM card into another mobile phone to check whether the SIM card is damaged. Please try to insert a SIM card that can be recognized by other mobile phones into this mobile phone, and check whether the mobile phone card slot is damaged.

The SIM card is used for a long time, and the chip is seriously worn or oxidized, resulting in poor contact. It is recommended to change the standard card in the business hall.

If the above methods can't be solved, it is recommended to upgrade the latest system version after backing up the data and try to solve it.

If it still can't be solved, it is recommended to back up the data and take the purchase invoice to the outlet for testing.

For more service offers, please pay attention to the official account of "Anhui Telecom" WeChat.