My charged iphone won't turn on?

So I used my iphone in the morning two days ago, and when I turned it off at school, it still had 90% battery. But after school my iphone won't turn on, even though it had almost full battery! What happened and how do i turn it on? Is it because my friend installed the app where you can play pokemon on the iphone for me?

1.) Plug it in and wait about 5 min.
2.) If this fails, hold down on the Power button for about a minute.
3.) If this fails, hold down the Power and Home buttons at the same time for about 30 sec.
4.) If this fails, bring your phone to your phone doctor.

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