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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.
Electricity unit rates and charges. A 'Unit' of Electricity: One unit of electricity is exactly equal to 1000 Watts of power used for 1 hour. When entering a figure in the price per unit above, ensure it is in pence, i.e: '12.710' would be 12.71 pence. If you're not sure on the figure you can find it on your bill or just leave the figure as it is.