I have tried so many BT headsets with the Treo 700p an 755p--Jabra JX10, Jawbone, Plantronics 640, and others. The Samsung WEP200 is a simple but functional BT headset that actually works with the Treo 755p. I use a BT GPS receiver with this phone and all other headsets, with the exception of the Samsung and the Jabra JX10, don't connect to the phone if the GPS is being used. Folks on the other end tell me that my voice is clearer on this headset. BT technology is still not perfect and many times, as in the case of the Treo, it is not the headset that is the issue but rather the BT on the phone itself. I would suggest you check the product compatibility first as this will diminish the chances of the product not working properly with your phone.