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I'm not aware of any monthly fee for Porsche Connect (required for Apple CarPlay). Are you referring to Connect Plus?
Whatever that thing is that's beyond basic radio or satellite radio that has the monthly fee. It's included in other manufacturers cars for free, such as with BMW.
Didn't opt for the Apple Car Play/Porsche Connect because I didn't want to pay the monthly fee, and I don't like compressed music anyway, particularly with the terrible audio system (Bose just plain sucks) already present in the car.
With AT&T, turning your iPhone into a mobile hot spot costs about $10/month, IIRC. For CarPlay and with that hot spot, you don't need to pay AT&T for extra connectivity.