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According to measurements from Lawrence Berkeley National Laboratory, the average cell phone draws 3.68 watts of power from the outlet while it's charging and 2.24 watts when charged.
Fellow Nokia user here. Basically, if your phone can be charged by data port, it will automatically start charging as soon as cable is plug in to the computer. If it doesn't then you cant charge it using data cable. There is a workaround for this issue for some phones.ellow Nokia user here. Basically, if your phone can be charged by data port, it will automatically start charging as soon as cable is plug in to the computer. If it doesn't then you cant charge it using data cable. There is a workaround for this issue for some phones.