Why does my iphone 3gs always tilt to the right?

I got an unlocked iphone 3gs, and my screen constantly tilts to the right. For example, whenever i play temple run, when my screen is perfectly straight my person leans all the way to the right. What's wrong with my phone?

There's an option for portrait orientation on the phone.

Goto the the app switcher (double press home button) -- swipe to the left and you'll see the lock button there.

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