Why can't mobile phones make phone calls and send text messages?

There are several reasons why mobile phones can't make phone calls and send text messages:

(1) Abnormal mobile communication;

(2) The mobile phone terminal fails and the mobile phone card is damaged;

(3) Local network problems, such as network upgrade and network failure;

The solution is as follows:

(a) You can restart or switch flight mode to try to search the network again;

(2) You can try to change your mobile phone. If the mobile phone is replaced, it can still be used normally, indicating the problem of the mobile phone terminal; You can also try other cards on the original phone. If it is normal, there is nothing wrong with your mobile phone. In this way, it can be judged whether there is a problem with the mobile phone terminal or the mobile phone card.

(3) If friends or relatives around you also use the card of the same operator, you can confirm with the other party whether the same situation occurs. If so, please explain the local network problem. For information about your local network, you can contact the customer service of your local operator.