The headset works pretty well with my treo 755p. In fact, it's the best headset I've found for the treo (tried plantronics and motorola previously without success). However, the ear hooks were missing from the package and Samsung customer service wouldn't even speak to me without me providing my phone's ESN numbers. WTH? I also attempted to make a request on Samsung's service website, which also would not function correctly. I called Amazon CS and they sent a replacement after 4 minutes on the phone. AWESOME!