Hi guys.... I managed to jailbreak and unlock a second hand iphone 3G which i got off ebay. I noticed that when I call someone or receive a call I have there is no sound going out from the Ear speaker. I have to switch it to loudspeaker to hear something. Im not sure if it worked before the jailbreak because I couldn't make a call whilst the phone is locked. Btw with music,videos etc the sound works pretty fine but for those kind of things the ear speaker isn't used i guess. With earbuds there is sound when calling someone also. I wish to fix this but I don't know where to begin. Is there a way to check if its a software problem or some kind of hardware failure?