[JaggedJax]

I personally carry my key card at all times. It's the size of a credit card in my wallet so it's no bother. Regardless of how good their network services could be, I would never want to depend only on my cell phone to drive. You know, the thing I own that's most likely of all things to run out of battery, break, get stolen, be out of service range. All things that would strand me.