I am not a bluetooth person. In fact, I laugh every time I see someone wearing a bluetooth headset like it’s a fashion accessory. I have nothing against bluetooth headsets just take them off if your not in a call. It really looks silly despite being super comfortable. I was testing out a new headset when I noticed on my Android 2.1 phone the background is a different color when using a bluetooth headset.
Traditionally, when I do a call with my wired headset the background is green but on bluetooth calls it is blue. It was a nice visual indicator. I usually give Apple credit for this type of extra effort and I was happy to see this from Google. This feature is both nice and simple. Not the biggest feature in the world but, a cool feature none the less.