Why does Unicom have to send a text message several times before it can be sent out?

If your mobile phone can't send short messages normally, you can try to restart or change your mobile phone for testing to see if the following conditions exist:

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;

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 your problem has not been solved, please contact local customer service for consultation.