SMS cannot be deleted! What should we do?

In this case, the factory settings of the mobile phone can be restored.

The specific operation is as follows:

1. Find the "Settings" icon on the mobile phone work page, and click Enter.

2. After entering the main page of settings, select the "All Settings" option button on the window bar.

3. After entering all the settings pages, find the "Backup and Reset" button on the page.

4. After entering the main page of Backup and Reset, click the "Restore Factory Settings" button below.

5. After entering the main page of restoring factory settings, click the "Reset Phone" option button at the bottom of the page.