Analogue Phone

[billybushby]

Hi, wondering if anyone can give me some advice as I have spent alot of time surfing but with no answers
Basically I have an 01 X5 without the phone prep, I have managed to buy an old analogue style phone and cradle from an E39 complete with receiver and full wiring harness with the hope that the wiring harness will make up the loss of not having the SA640 option and some modifications might allow me to install bluetooth? Does anyone know if I remove the cradle from the analogue phone will another type of cradle just swap with it or does it require additional plugs/harnesses? Any info or advice to the right direction would be much appreciated

Cheers