The bluetooth is really poor. I happen to have a dozen or so mobile phones kicking around (app developer, go figure) and I've tried it with all of them. i can connect more solidly to a bluetooth device in another floor of my house than to my AmplifiFX 2 feet away. iOS devices appear better from my experience, and in contrast to the above post the most stable iOS connection I've had is from an iPhone 4s. One tip that might help - remove any clutter around the unit, if you arent using the main outs/phones/USB at the time unplug anything from them and remove all the cables. I do tend to have a better connection that way.