The volume is fine when I use the iphone to place and receive calls using the D3 through bluetooth. The problem is when I try to hear voice mails through the D3 unit. The volume is extremely low. I have to turn the D3 all the way up to 40 in order to just barely hear the message. I double checked that the volume level for th bluetooth output is all the way up on the iphone, so that's not the problem. Anyone got a clue?