Cell phone power and battery information?

I have a project for school and I need some info regarding cell phones.
How much power does a cell phone typically use when its just on and not in use?
How much power does it take to turn on or turn off a cell phone?
Whats the typical battery capacity of a cell phone?
How much energy does it take to charge a cell phone battery?

If possible, I’d like to use smart phones for this information since they probably consume more power, but i guess any cell phone would do. Thanks!

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