OK, I have had the Motorola HS850 and that worked a little and it was only good to use for a call but I couldn't end, make or voice dial, and it would cut me off. I then got a Sony Ericsson from Sprint and was assured that it would work well, it did for 3 days and then it went into pairing mode and would not come out of pairing mode. The next one I got was a Bluespoon AX2. I'll say that this is the coolest headset I have ever owned. It was small and light and fit in my ear well, but 9 times out of 10 it would beep every 3 seconds during a call and everything for no reason at all, but I tried 3 of them because I liked it so much. My next adventure was a Plantronics Explorer 320 which worked well but it was really really staticy. I am now using a Motorola H700 and it has given me a little trouble because it has come unpaired twice, but it was an easy fix, and it seems to have good sound with little static. So far this one is the best for me, but another A900 would probably have a problem with the same headset. What I have found is if you love the phone try every headset you can and just return the ones that don't work right and go to another.