Have been through 2 returns with Cingular now and I still cant hear out of one side of the headset. Have tried the headset on a Blackberry and Sprint version of the 8125, worked there.Windows Mobile still needs to mature. There is no way to set a beep incase you have missed a call or an SMS (if you were away from the phone or something). No way of knowing you missed a call unless you actually look at the display. The process to set mp3 ringtones and SMS/EMail alerts was extremely painful as well.