I noticed a problem using Google Now (GN) after the Jelly Bean update last week: GN's voice recognition wouldn't initialize. At the time it was driving me nuts cause it seemed to work sometimes and other times not. It made no difference whether the head unit was set to BT input, radio, or completely off. The phone only exhibited this when it was paired and BT calls worked perfectly every time. I spent a little time, while parked mind you, to work it out. It's clearly a bug in Samsung's implementation as I paired my Nexus 7 and it worked perfectly every time. If you're having this issue, the workaround seems to be: Launch GN Press the mic button. Hit the Back softkey. Then hit the mic again. Works every time now.