posted on Mar, 30 2011 @ 03:00 PM
I had a similar problem with my iphone 4.. Have you tried putting the phone in silent mode, While the headphones are unplugged ?
On the I phone when the headphones are plugged in, I can only turn the headphones up, or down.. But the phone will still ring..
But if I turn the volume all the way down on the phone, and then plug the headphones in..Turn the volume back up and, The ringtone remains silent,
While the music still plays.. Just Give it a try.. That's how i fixed this issue with the I phone..