IPhone 4 lock button replace?

My lock button was really hard to push a while but with a lot of force it did the job but then all of a sudden it stopped working so I opened up the back and looked at it and I think the black band under the lock button is cracked or something. Do you know what I would need to purchase in order to replace it? Or if that's even the problem. I need to fix it As soon as possible.

Put your phone back together. Take it in to an Apple store and if your still in warranty you should be covered. If not they can give you options as paying $149 and they will give you a whole new iPhone 4. Or if the person is nice enough they might give it to you for free.

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