Looks like the free trial subscription has expired so I called Sirius. They asked for my ID number in order to activate the radio. The rep tried to explain how to find the ID number but basically had know idea what he was talking about. Thanks for your help. Don't know if it matters, I have a 2005 X5 with navigation.

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2005 X5 4.8is
2002 E39 M5- sold
1995 E36 M3- sold