I have left that phone installed in my 2002 just for grins. White46 is correct. It has no sim card. It worked fine in 2002. Was hands free through the audio system. It wasn't long before it was very outdated. I kept the phone line to use only in the vehicle for a time but I wasn't on the phone that much so it wasn't worth the cost of a second phone line. Add bluetooth to your X5 and come back to the future.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas