How do get my iPhone to restart?

I turned my iPhone on and it is now stuck on the apple logo, I've tried restarting it by holding down the buttons but it doesn't work and I don't have a computer to connect it to iTunes!

You've got to hold down the power button and see if it turns off. If not keep the reset held down until max 5 mins. If there's still a problem you may have to go in store.

Hold down the power and home button at the same time.

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