I just purchased the Treo 680 a little less than a month ago. I have noticed that sometimes when using a wired earpiece, I can hear the person on the other end, but they cannot hear me. I know it's a phone problem, because I've tried 3 different earpieces. I also know it's not a reception problem. Has anyone had this problem? Any suggestions. I hate that I may have to send my unit in, especially since they're going to send me a re-furbished unit; I feel like that's so unfair because I paid for a "new" unit, not a used one.

Further, my Bluetooth Earpiece works fine.