Oppoa9x keeps showing SMS sending error. What happened?

The failure of sending and receiving short messages is generally caused by the wrong number of the information center, the arrears of the number, the abnormal reception and forwarding of the network base station, and the failure of the mobile phone. You can refer to the following methods to see if you can solve it:

1, consult the phone bill balance of the mobile phone card to see if there is any arrears;

2. Correct the information center number, first check whether the mobile phone information center number is correct (compare it with similar local cards or consult the operator to confirm the message center number);

3. Compare and observe the changes of SIM card and different time periods; Setting method of short message center number

For coloros version 5.0 and above, open phone settings > system application > information > more information settings > select and click on the card to view (this is not required for a single card) > information center number.