Why can't the SMS center number be sent out after it is set?

There may be the following situations: 1. You have too much information. Just delete the redundant information in the outbox and inbox. 2. Check whether the SMS center number in the mobile phone settings has been deleted correctly. Network problems occur from time to time. The most depressing thing is that your mobile phone is in arrears. Solution: recharge. 5. It can't be sent if there is no signal or the signal is poor. I don't know if you are satisfied with the answer. Is your mobile phone set to store the sent information? When your storage space is full, it will prompt that the storage space is full. If there are sent messages, try to empty them. Sometimes you can't send a message because of network problems, such as the phenomenon that you can't send it on New Year's Eve. I suggest you turn the machine on and off again. If you can't solve the problem, go after the sale and see if it is a software problem!