turn off iphone

Yes, you read that title correctly! I am doing an entire how to on turning off your iPhone, iPod Touch and iPad. Why? Two reasons. The first is that I was out to dinner with my girlfriends and one had her Facebook app freeze up on her. She deleted the app but then her iPhone promptly froze up. She asked me what to do about it and I gave her my fallback answer – turn your phone off and back on. Her next question surprised me a little bit – How do I turn it off? Fast forward to about a week later when my husband was going over some technical analytics mumbly jumbly stuff for this website. He told me that a large number of people reach this site through search results for the words "how to turn off iPhone" or something similar. What? I get a huge amount of traffic to my article about shutting down apps but shutting down the phone? I'd never thought about answering that question but apparently there's a need for some simple instructions.