Do cellphones have some reserve power in their batteries that one can use even after the phone hs go

my phone is motorolla L6

I hear that thre is a code that activates reserve power

Answers:

No. Am definitely sure they don%26#39;t have reserve powers. But what I know is the reserve battery you were refering to is the power for keeping the time and date for some of the phone. But not all models of phone has this kind of functions.

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