I have an '06 C280 4matic. I have a cd player, a 6 cd changer in glove box, and steering wheel controls. I have telephone buttons and a menu option, but do not have a phone. I would like to install a fm direct adapter for my sat radio and maybe if not too pricey bluetooth and phone control. (iphone) How do I know what model radio I have or if it is command or not. Thanks!