Yesterday while doing some work (with phone in pocket) my phone dialed some number as it tends to do once in a while. I heard it dial (the boop boop boop noise) but no ring so didnt bother to take it out to hang up. I could hear a little static once in a which I later understood to be the BT connection open. A little while later I left the job and used the navigation to head back home. To my surprise (darn near made me crap myself) navigation directions came through the BT (plantronics discovery 975) Initially I thought maybe there was an automatic update, but after receiving another call the navigation was back to speaker. This morning I decided to try to replicate the situation. I went through my call logs and found my phone dialed ?9797**. Thats right, a question mark. I cannot figure out a combination that will allow a question mark on the dialer. I saved that call in my contacts (as Btooth) so I can dial it. Sure enough it works every time. I dial it, it goes boop boop boop, then immediately goes back to the dialer screen (no ringing, no ongoing call screen). The BT connection is open (can occasionally hear some static / pop noise)and can start nav and hear the directions through BT. Dial the number again and It shows "Call ended" and the BT disconnects Well for what its worth, If anyone can figure out how to dial a ?, its not too much trouble to speed dial off the home screen before starting nav in order to have this feature IMO. Of course it would be better if it was designed into it.