immediate consumption is important TIME usual time of use consumes a lot of display brightness, which multiplies a long time, a lot of time consuming calls at a great distance from the BTS, but usually does not call for so long can not be easily determined anyway there are a few principles: - half the brightness of the display means a tenth of the consumption - a certain effect is unnecessarily turned on wifi and gps, the consumption is small, but it works all the time - a large effect has a stay outside the GSM coverage, because the mobile phone automatically amplifies the sensitivity of the receiver