I have BT in both my E83 and E46 and have used just about every model of HTC phones with both and never had an issue. The E46 is a bit slower but works to my satisfaction. I don't understand the methodology that some dealers use to justify the creative use of service. When I first installed the BT module in the E46 (most of the information came from Europe) I had spoken to two local dealers regarding said use of BT. They really didn't have a clue and were not even aware that it existed as a retrofit on an E46 (years ago). The sad part of all of this is that the consumer is now more knowledgable of the vehicle that they spend much money on and many dealers are still treating customers in a condescending manner. Historically I noticed this with MB dealers in FL on my E series.

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1