G3 suddenly can't send text messages.

See if the SMS service center has set a number. I've met it, too, and I found the number is gone. It can be set in the following ways: the service center number that must be set in the SMS settings, the mobile phone number is +86 13800XYZ500, and XYZ is the area code of the location (there is no 0 in front, so the digits are not enough to add 0, such as Beijing: 100, Shanghai 265438+).