I am using this device with an HP IPaq 6315, which is admittedly not the world's greatest phone to begin with.The Plantronics is basically useless unless you can insulate yourself from external sound sources. So you can exclude such mundane uses as walking on city streets. In Manhattan the only way I could hear another person was to cup one hand over the Plantronics unit. If I wanted to do that, I could have just held the phone to my ear. What's the point of a hands-free connection that requires hands to use?Keep shopping and leave this thing on the store shelves, where it belongs.