Why Iphone 5 won't play horizontal anymore?

I used to be able to turn my phone to the side and view videos full screen on my iPhone 5. But lately it won't let me. It will continue playing vertically even if I turn the phone. I've been looking through my my settings all day. Can't figure out what's wrong. This all phones or just mine? How do I change it?

Do you have rotation lock enabled? Open up the control centre (swiping up from the bottom of your phone) and make sure the arrow with the padlock in it isn't enabled, if it is then tap it to disable it.

Maybe you have it on portrait lock,
For iOS 7+ you can swipe up from the bottom and tap on the icon with a lock inside an arrow with a circle
iOS 6 double click home button and swipe right and youll see the same icon

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