Telecom Apple mobile phone 4S can't send text messages

Hello, first of all, thank you for your support to China Telecom. According to your description,

1. Restart the phone, and test whether calling and texting are normal.

2. If restarting cannot solve the problem, confirm that it is a mobile phone problem, and you can back up the data and restore the default settings of the mobile phone.

3. If it doesn't work, please connect the computer and update the firmware.

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