Iphone headphones wont work, damaged hardware?

I don't really know if this is the correct place to post this but well..

I've been using the standard Iphone 5 headphones for a while now until recently they stopped working as they should, won't play/pause using the button thingy on them. So I tested them on my friends Iphone 4 and they worked as they should. So just wondering if I've damaged the hardware in the phone somehow or changed any settings by mistake

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