Why can't vivo send text messages?

The mobile phone can't send short messages: 1, and the cell phone signal is not good. It is recommended to try another area with good signal. 2, SMS center failure or maintenance, you can try another time. 3. The phone bill is in arrears or the SIM card is broken. Recharge the SIM card or try to replace it. 4. The number of SMS center has been modified and cannot be sent normally. Click SMS-Settings-SMS Center Number-View SMS Center Number, and then search your local SMS Center number online to see if your mobile phone is correct. 5. The mobile phone data is abnormal. You can restart it and try, or if it doesn't work, try restoring the settings. Go to phone settings-General/More settings-Restore factory settings-Restore all settings (without deleting any data of the phone). You find your problem and try to solve it according to the above method.