Re: iPhone 4S - Tips, Tricks, and Advice
Double tapping the button brings up the open apps function...scroll to the left (where the music control buttons are) and the far left icon locks your screen from auto-rotating. Handy when you're lying on your side trying to view your phone in portrait orientation.
If you don't use Apple's iCloud features...turn them off in the settings. They will drain your battery like crazy. (Side note: The one exception to iCloud syncing I have is for my "Find iPhone" app, it requires it to be on)
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