Iphone 3GS sound problem, can anyone help?

Hi, my phone will not play any sound out of the speakers at all. I can only hear sound if i listen with earphones. I have the phone on contract and i bought it in an 02 store.

1. does anyone have any idea how to fix it?
2. failing that, where should i go to get it repaired, I havent got insurance on it but my phone is still under warranty as i bought it only 2 months ago. Should i take it back to the 02 store, or should i take it to an apple store.???



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