I have a T-Mobile MDA which is a HTC Wizard sold under various names by all the major carriers. It is A2DP compliant since it is a new phone, but it has MANY issues. In order to use it, I have to keep refreshing and saving this device on my bluetooth set up screen. The music goes in and out sometimes for 2-3 seconds. Every once in a while I can listen to a whole song w/o any interruptions. I don't know if it is a part of the connection issue, but some of my songs play slower than normal like the battery is dying when it is fully charged. When I do switch to a call coming in or out, the other person can barely hear me. It's best to try this out a brick and mortar store so you can return it easily if yours works like mine. I almost forgot, the clip is so weak that it can not tightly grip onto your shirt or anything for that matter so it keeps falling off.