Red rice note mobile phone can't send text messages, only receive them. What happened?

1. If you have changed the SMS center number, you can contact the local operator to get the correct SMS center number, and fill it in again in Mobile Phone Settings-System Applications-SMS-Advanced Settings-Set SMS Center Number;

2. If you haven't changed the number of the SMS center, you can enter * # * # 4636 # * *- select the corresponding SIM card-click Update behind SMSC-get it automatically. If you get it successfully, you can try sending SMS again.

3. If you still can't send SMS, take off the mobile phone card, insert it into another mobile phone and set the SMS center number, and then insert the SIM card back into the mobile phone;

4. Turn off or uninstall optimization software, such as power saving, optimization, assistant, forced termination of tasks, etc.

5. Some non-operator SIM cards may not be able to use the SMS function normally.

6. If the above methods are not solved, you can back up the data and go to the after-sales outlets for testing.