Mobile phone response is slow, especially when answering the phone, and it is often impossible to dial out. You have to dial more than twice. It's obviously not turned off, but you will receive a text

Mobile phone response is slow, especially when answering the phone, and it is often impossible to dial out. You have to dial more than twice. It's obviously not turned off, but you will receive a text message from your mobile phone. Hello, there may be some applications in your system that interfere with the normal operation of the system, especially some programs that get root permission. For the security of the mobile phone system, please don't use root permission at will. It is recommended that you back up your data, enter recovery to clear all data (turn off your phone, press and hold the volume up+power on button to enter recovery), upgrade your phone to the newly developed system with a wire brush, and don't install the application that requires root permission for the time being to see if it can be restored to normal.

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