I can't send text messages in my spare time. What happened?

This situation is because there is something wrong with the network settings of the mobile phone.

It can be solved by resetting the network settings. The specific operation steps are as follows: 1. Click Settings on the desktop. After entering Settings, slide down the phone screen and click General Options.

2. After entering the regular page, slide down the phone screen, find and click the "transfer or restore iPhone" option.

3. After entering a new page, click the "Restore" option to pop up a pop-up window.

4. Select and click the "Restore network settings" option in the new pop-up window, and then enter the password to restore network settings.