Yes i just picked up my Mustang this week. And it had this phone unit next to the radio with answer button and speak command button, spoke to it messed around in the settings, sure enough if i had a bt phone i would have hooked it up.
Now the shaker 500 cd player didnt work , so my deck was the first item to go in. I had thought the bt phone thing was probably after market of some sort, but when i started taking it apart its a factory ford blue tooth phone accessory unit. Its plug and play to a shaker 500 system. Kinda a cool find, thought it might be worth a few bucks.