Why can't mobile phones always send text messages? Among them, the SMS has been successfully sent, and it cannot be sent again.

In this case, if you are sure that the SMS center number is correct, there are several ways to check:

1, you can check whether the information sending report of the mobile phone is on, and set this function to off.

2. If it is caused by sending a certain amount of short messages, it is generally because the short message function in the operator's office is limited. You can call the corresponding customer service to explain the situation and then cancel it, and then you can resume. (But only if the mass message is not spam)

3. You can ask people around you whether the short message is normal or not, and eliminate the influence caused by regional network failure.

4. Delete some short messages in the mobile phone to prevent the mobile phone from being sent because the memory is full. (Includes Outbox and Inbox)

5. Restart the mobile phone, and then exchange mobile phone card tests with friends.