Lock button on iPhone not working?

I got my iPhone about 5 months ago and the lock button is already not working properly. I have to hit the very edge of the button in order to lock my phone and sometimes that doesn't even work. Will Apple send me a new phone if I request this to be fixed?

If you has a warranty, no water damage and never jailbroke apple will replace it with a referbished iphone 5

This video have your answer…

this tell us how to lock apple phone without using that particular button.through setting you can do that.

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