Cell phones can make calls, but they can't send text messages. What happened?

Mobile phone can't send text messages. Check whether the following conditions exist:

1. Whether the SMS center number is set correctly, please enter the correct SMS center number;

Second, there is no signal or the mobile phone battery is insufficient;

3. The system is busy during the peak period of holiday SMS sending, so it is suggested that you try again later or avoid the peak period of sending;

Fourth, the mobile phone shields the short message sending function;

5. The other party's number is blacklisted;

6. Insufficient quantity balance;

Seven, SMS inbox and outbox are full.