http://www.lifehack.org/articles/technology/21-incredible-things-your-iphone-could.html

Your iPhone can do all sorts of things to make your life just a little easier in ways you probably didn’t know. Here are 21 features you can start using today! From Shake to Undue – to Finding out which planes are flying overhead right now! 

Some might call these ‘hidden features’ but I prefer to think of them as simply undiscovered. Perhaps you have a favorite ‘undiscovered feature you found or use on your iPhone – if so, why not share the love?
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Dr. Eugene Matthews