If your iPhone won't turn off the usual way, you can force restart it with a button combination specific to your iPhone model.
4don MSN
I just discovered what’s really draining your iPhone battery — and it’s not what you think
Learn how to uncover the hidden iPhone features that are secretly draining your battery and how to turn them off for good.
Results that may be inaccessible to you are currently showing.
Hide inaccessible results
Feedback