because the build date of your x5 is before mid 2004 your Bluetooth wont work with any phones except the one that comes with the car from factory I think

if you have the bmw assist package and if your x5 has the module in the back already which sounds like you do

you can buy a Bluetooth module off ebay from a x3 or a 2005/6 x5 and its plug and play, the pairing code is on the sticker on the module

first 2 mins of ignition on is pairing mode

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04 black on sapphire 4.8is personally put 90,000kms
fully loaded minus the fold out trunk floor
-20' DUB X10 3 piece rims staggered setup
-LED angel eyes + interior lights + e70 style shifter
-AFE stage 2 intake system
-x-pipe/resonator delete
-UV coat windshield
-rebuilt Pano roof
-dynavin N6
-all front and rear end suspension parts and both front cv shafts replaced
-OEM hitch

And 2007 GSXR750