This is a really annoying problem where my iPod does not detect when my headphones are inserted, so the speakers are always on! It started as intermittant but now it does it all the time. It's odd because the volume level has no effect on the earphones but it does change the volume of the speakers. I have restored many times and the problem happens when jailbroken or not. My phone is just over a year old so I guess I do not qualify for the warrenty.