how does pressing and holding red button turns the cell phone on?

Monika

New member
does any one know what happens when pressing and holding red button in cell phones that turns the phone on or off?
i checked to contacts under keypad both of them was zero volt and non of then connected to the ground of its board.
I want my cellphone to turn on whenever i connected the battery what should i do ?
maybe i should and an rc circuit to it. (like reset circuit in micro controllers)
 
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