What should I do if the T 15 mobile phone suddenly can't send and receive short messages?

Hello, if the mobile phone is not in arrears, it is likely that your SMS center number has been accidentally changed. Please correct and set the SMS center number: main menu-Info-SMS-SMS Settings-Mode Settings-"Mode 1/ Mode 2/ Mode 3/ Mode 4" (Mode 1 has SMS center number by default, so mode 1 is generally selected.

As for the number of SMS centers, different regions are different, and China Mobile and China Unicom are different, so I can't tell you. Suggest consulting your network service provider!

Also, if the SMS center number is correct and it is not the fault of the network service provider, it is recommended to refresh the phone firmware. If you can't refresh the phone firmware, please go to the OPPO after-sales service center for help. Note: Before refreshing the phone firmware, please back up important information, such as "phone book, SMS, etc.", because refreshing the phone will clear the information in the phone!

I hope my answer can help you!