I have the Samsung Blackjack II and this bluetooth works perfectly for this phone. I ordered the bluetooth from Amazon about a year ago, and it still works like new. I am not sure what none-Sony phone the other reviewer has, but I can say that this bluetooth does work with my Samsung phone. The voice quality is excellent (I guess that's what Sony is good at - audio qualities) comparing to other bluetooths that I've tried. And it does filter out background noise relatively well. Compare to other models, the sound quality is definitely more stereo than monotone. The only thing I don't like about it is the ear hook so I don't use it. The bluetooth earpiece fits in my ear pretty securely so that's how I've been using it so far. I am thinking about getting a rubber plug to make it more tight-fitting.