Iphone 12promax SMS can't be sent out.

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

1. SMS center number is not set correctly. Please re-enter the correct SMS center number.

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

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

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

5. The short message sending time exceeds 24 hours;

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

7. Blacklisted by SMS;

8. Insufficient quantity balance;

9.SMS inbox and outbox are full.

If the problem cannot be solved by the above methods, it is suggested that you can contact your Unicom customer service for consultation and feedback. The specific situation is subject to local policies.