Motorola :: C139 Stuck On Headset?

I've had the c139 for about three years and an very happy with it. However, it's developed a problem I cannot seem to undo. On the home screen, there is a headset icon, and next to it on the right is a phone with a 1. I do not have a headset. Never used a headset. Never set up the phone for speed dialing. Very basic pay-as-you-go use: call - receive - textSince it started displaying these icons, I cannot hear anyone when they call in. The buttons no longer beep when I press them. I cannot hear to call out. However, the text works just fine. This is what I've done to try to fix it:Settings>other settings>headset>auto answer (no other option)>off