I have looked everywhere and cannot find out what the "10" stands for next to the BT symbol in the picture below. There is nothing in the manual (Nav/Entertainment one) referencing the symbol meaning. I don't have any emails or messages on my iPhone 5. I've had as much as 30, still no emails/messages on the phone. I was looking at it today trying again and it went from 9 to 10. Anyone have a clue?