weird little problem... i can't get sound via headphones from the iphone 3G (running whatever is the latest version of 2.x) from only the phone app. people can hear me if i talk into the mic, i can't hear them. can't hear the dialtone or ringer if i make a call but i can hear the touchtone sound if i dial from the keypad. everything works fine when i take the headphones out and use the iphone's earpiece. tried both the apple earbuds and my sennheiser mm50 ip. other apps (ipod, youtube, bloom) all play sound fine through the headphones. it's only the phone app. i haven't done any updates, OS or App-wise since the last time it was working fine. i've resynced with itunes, rebooted, reset, everything but restored. any ideas? anybody else have this problem? thanks!