Originally Posted by DUKEL
Yes it is compatible. I read someone bragging about how pleased they were with using the s9 with the 3Gs.
That's good to know. I just bought one from ebay brand new for $20- free shipping, and after I ended the auction, it said you need adaptor for iphone and ipods to work

I was a bit disappointed. I wonder if the sound quality is more stereo instead of mono because they also have the S9-HD..Thank you for letting me know... it wouldnt make sense if apple released a stereo bluetooth for 3GS and not be able to use the headset.. thanks again