What if I can't send a text message?

1. First, check whether the mobile phone is in flight mode, and slide up from the bottom of the screen on the main page of the mobile phone.

2. Click the "small plane" icon on the control center page to close the flight mode.

3. Open "Settings", slide down the screen, find "Information" and click "Enter".

4. Next, you need to turn on the iMessage information switch, as shown in the figure below.

5. Or return to the "Settings" page and click "General".

6. Slide the screen up to find and click to enter the "Restore" option.

7. Click "Restore Network Settings" to reset the network, as shown in the figure below.