This headset is fantastic with the Motorola Razor, but does not work very well with a Palm Treo. I had a Jarba, which died for no apparent reason that worked, to an extent, but the sound quality, mainly the volume, was not good. According to some sources, none of the wireless headsets are very compatible with the Treos, except for maybe the headset specifically designed for Palm, which I hear are very expensive and bulky. If anyone knows of a headset that works well with the Palm Treo (meaning good sound quality, ergonomical, comfortable, etc.) please let me know at gentryonceagain@yahoo.com.