Apple can't send text messages after changing calling cards.

There are several possibilities for this failure:

1: The mobile phone is a parallel lock, and the signal is locked, so the signal in Chinese mainland cannot be used after the card is loaded.

2. The mobile phone system is wrong, that is to say, the baseband in the system is wrong, which makes it impossible to use wireless functions and search signals.

3. The SIM card slot of the mobile phone is faulty or the mobile phone card is in poor contact, so the mobile phone card cannot be identified.

Article 1 The solution is to buy a special card, which can be used after being cracked.

The second solution is to brush the machine, and it is recommended to brush the corresponding latest version of the system.

The third solution is to pull out the card and put it back. If it still doesn't work, it can only be sent to a repair shop for repair.