Well still have not figured this out. When my BT is connected to the 3100 and the GPS10 I can only talk from the phone and not through the handsfree kit. When I answer the phone it sends the call to the phone with the good old music symbol with a slash through it. Anyone have the same set up? Or is it the 700WX can only connect to one BT device at a time? I do not remember having this same issue with the 700w.