iPhone 4s Headphone Jack not working...

I have had my iPhone 4s for just over two weeks now and this morning when i went to plug my headphones in i got no sound.
i tried multiple pairs of headphones, restoring my device, and i have checked all the obvious settings that could have stopped sound being played.

The phone plays music fine throught the speakers and recognises that there are headphones plugged in but doesnt play any sound.