You can remotely shutdown Android by sending SMS with secret code or by calling it from a specific number.
This feature comes handy in many situations such as you forgot the phone at home and want no one to attend your calls.
You can do these by using the third party apps and these can be only done on the rooted Android device.
So, if you have a rooted device, then you are good to go.
Remotely Shutdown Android
Both the methods works well. But, I suggest you to go with the SMS method. Because, it provides you the option to send SMS from any device to do this task.
But, as I said before, both the method can do the task. So, pick the one you prefer.
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