I have a bmw bluetooth ulf that I fitted to my Range Rover Vogue (2003). It didn't work with my Motorola Moto G phone but worked fine with my older ZTE blade. I'm told it should work with all iphones up to iphone 4. You have to rewire the 54 pin plug to use it but there are guides to do this on various sites. Prices as below:

ULF unit £90
bluetooth antenna £20.
Fakra connecting lead from ULF to antenna £15

I also have the old telephone unit out of the car which is a Siemens unit that has a cordless phone in the centre console
Control Unit - £40
Base Antenna - £15
The cordless phone works but there is no display so £15 for spares or repair.
Centre console holder for phone £15.

All prices include postage.