Why won't my iphone home button work?

It was working fine half an hour ago, i put it down to go up stairs, came back down and it had stopped working! Why?
i haven't dropped it or done anything to break it.haven't even got water in it.

Added (1). Can you get the button replaced?

It should work if you keep pressing it, this has happened to just about everybody I know who has an iPhone, me included and there's nothing you can do about it. It must just be a problem with the phone

Maybe it's just been overused, the same thing happened to my iPod. Try pressing it softer and using it less.

I have an APPLE 4S too.
It was very hot when i charge for it.
I ask my customer manager, she tell me that, i should go to their company make an check.
I was really disappointed with Apple's quality.
Also regret.

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