[gojomo]

I absolutely hate carrying around both my phone and my wallet in my pocket. What if I could just carry around my phone and my driver’s license?

Why stop at eliminating the wallet? I expect someday -- perhaps quite soon -- some state will allow a mobile with the right app(s) to serve as a Driver's License.

And why not? It could contain digitally-signed info which includes the photo and everything else appearing on traditional cards. For better or worse, police could even check it at a distance.