I still print it out because basically, the alleged benefit to speed of using your mobile is offset by the fact that people spend too much time trying to find it at the scanner, then their phone goes to sleep at the wrong second, the scanner misses it, then they scroll through all their pics to get it back. In short, people don't know how to use it efficiently.

Paper is easier.

Lastly, in the event that you are stopped by a customs or security person somewhere who demands to see it, it is better to give them paper than let them look into your phone