Omega car kit fitting - dealer doing my head in! :-)

My dealer is claiming that the roof aerial on my 2002 Omega Elite Saloon
does NOT contain a GSM aerial - just the GPS and radio aerial. Everything
I've read contradicts this - I think that the roof aerial "blob and stick" I
have contains both the GPS and GSM aerials and that the radio aerial is in
the back screen.

Can anyone confirm this?

Also, assuming I'm right, where does the GSM aerial connection come out? Is
it just in the telephone pre-wiring loom?

Cheers, Clive