can you replace your iphone if the button dont work

If the iPhone remains under warranty and this is not determined to be caused by accidental damage or abuse and cannot be resovled by any other means, the iPhone should be exchanged under warranty. Every warranty claim is on a case by case basis.

when did you get the phone? if it was within 1 year and not due to poor care of the phone then they should replace it for free. otherwise it will be an out of warranty repair that will cost $200