Maximize Battery LifeAnswer
There is a separate sensor situated right above the earpiece, that detects ambient light. The iPhone uses this sensor only once per session, just as you unlock the handset. But if you cover the sensor as you unlock the phone, you will trikc the handset into thinking it’s in a dark room, and it will power down the screen brightness. You can Also turn off Bluetooth and WiFi if you don’t expect to use them for a while. You can also set email fetch time to “Hourly” or “Manually”, and turn the “Push” off in order to save energy.
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