Why can a mobile phone receive short messages but not send them?

If you are using a vivo phone and can't send SMS, you can try the following:

1, it is suggested to try another area or time period with good signal;

2. Check whether the phone bill is sufficient or change a SIM card;

3. Enter Settings (Application and Permission)-(System Application Settings)-Information-(More Settings)-SMS center number-Check whether the SMS center number is correct (local SMS center number can be searched online);

4. Go to phone settings-System Management/More Settings-Backup and reset/restore factory settings-Restore all settings (without deleting any data of the phone).

5. Take the mobile phone to the local vivo customer service center for testing and processing. (The address and detailed information of customer service center can be found in vivo official website APP- Services-My Services-Service Network-Select Current Province and City).