I purchased this unit with high expectations, and was very disappointed to find that none of the control functions work with my Qwest Mogul phone. I also purchased a Lubix bluetooth stereo headset, and all the functions work properly on the Lubix unit, so the problem has to be the Jabra unit. When talking on the phone, the sound quality on the Jabra is very good in both directions, but not being able to control the windows media funtions is a killer for me. Also, these things are VERY bulky and clumsy to use. I cannot recommend this headset when there are other better sets available.