Why can mobile phones receive text messages in other places but can't send them out?

Today, try to change the center number, set the information-SMS -—sim card information center, delete the number and re-enter, then turn it off and on again, and miraculously send it. The center number should be asked at your place. The telephone number is 10086. You can also try brushing the machine.

The reasons why mobile phones can't send short messages are as follows:

1. No or wrong SMS center number is set, just reset it;

2. The signal is weak, there is no signal or the battery of the mobile phone is insufficient, resulting in the information not being sent normally;

3. The sending format is incorrect. If you send a short message to PHS users, you need to add the area code before the number;

4. SMS sending and retention is valid for 24 hours;