Got it working with the Cingular Sync aka Samsung A707. People say I sound great on it and didn't realize I was wearing one and I have a car with a lot of wind-noise. Fit better once I cut off the loop. And I can see why people say it hurts after a long time or it may fall off. I don't intend to use it for hours or use it out of the car. So if it falls off, it will fall under the seats where I can retrieve it. The only reason to use it is in the car due to the state law. I turn it on before I drive and when the phone rings I put it in the ear and hit the button. When I'm walking around, I use the handset. Its my first BT device and it does what it supposed to do. Which is handle calls well while I drive. If you are looking for one to wear all day in the mall, this is not the one for you.