Whoopsy:

It's true. You local cellular providers haven't reach an agreement with Porsche yet. They have yet to agree on a fee and terms.

Not pitfall, more like Tesla NEEDS the mobile communication so will pay whatever and agree to whatever demanded by cellular providers, Porsche and other car makers are wiser with their money and negotiations. 

If this is true, this is even more annoying.  

It is a frustrating EV experience to not have the app access to a BEV, just for Porsche to save some bucks on the cellular negotiations for a $250k car.