Apple mobile phone can't send text messages. What happened?

There may be two reasons why the SMS sent by Apple's mobile phone cannot be received, and the solutions are as follows:

1. If there is a problem with the network settings, just click Settings-General-Restore-Restore the network settings.

Second, use itunes to restore the system.

Start iTunes.

Insert the iPhone, press and hold the On/Off key and the Home key 10 second, release the On key when the iPhone is blank, and hold it all the time.

Until iTunes comes out of the iPhone interface.

At this time, Windows will first discover some new hardware and drive it by itself. After iTunes automatically recognizes the iPhone, a prompt box will pop up-"iTunes has detected that an iPhone is in recovery mode, and you must recover this iPhone and use it with iTunes". Click OK at this point.

Open itunes, and in the section that displays iphone capacity and information, click Restore to start the recovery process.

Before the data cable connection screen is displayed on the iPhone, iTunes will prompt that the firmware recovery is complete.