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How does Apple's mobile phone completely delete information?

How to completely delete the information of Apple's mobile phone

1. In the setting information, turn off iMessage.

2. In set iCloud, close the keychain and find my iPhone.

3. The settings are universal. In Restore, select Erase all contents and settings.

4. Note: If necessary, enter the password, that is, the screen lock password.

5. Finally, select Erase iPhone, and the deletion is complete.