You can't send text messages when you are on the phone.

If you can't send and receive short messages, you can try to restart your mobile phone or change it to test whether there are any of the following situations:

1, SMS center number is set incorrectly;

2. There is no signal or the battery of the mobile phone is insufficient;

3. The mobile phone shields the short message sending function;

4. Insufficient quantity balance;

5.SMS inbox and outbox are full.

If the above situation has not been solved, it is recommended to contact customer service for consultation.