Li Jing can't send or receive short messages. What happened?

What should I do if my mobile phone can't send short messages? Can be ruled out in the following ways:

1, confirm whether the SMS service number is accurate, such as: SMS → More → Settings → SMS Service Center → Set it as the local accurate SMS center number (consult the network operator);

2. Restart the phone;

3. replace the SIM card;

4. Back up important data and restore factory settings;

5. Bring the purchase invoice and warranty card to the mobile phone for after-sales treatment.

When the mobile phone sends a short message, "Send function is disabled" is displayed. You can exclude it in the following ways:

1. Tencent Mobile Manager → Click on the avatar in the upper right corner → Settings → Secure SMS → Turn off the "Secure SMS" function;

2. Settings → Application Management → Configuration Application → Default Application → SMS → Information;

3. Uninstall the installed third-party software such as App Store and QQ Synchronization Assistant;

4. Back up important data and restore factory settings.