I had a problem with Ticketmaster and Cyclones.com getting them to work on my phone. I also have had ZERO coverage around Jack Trice Stadium with my phone. I have a weird carrier. It is no different this year. But I was at home and printed my own ticket on my crappy inkjet printer.
Dude at the entry gate told me to go to the shortest line and I was in. 2nd Dude scanning my ticket said "You making it easy on me."
No, "Dude" You made it easy on me. I looked at all the people trying to show phone images and whatnot and people arguing over stuff and realized that sheet of paper and a little bit of ink saved me 10 minutes of angst.
I imagined a ticket taking catastrophe. It was not. I have heard other stories that were much worse, but if you have the ability to print out a scannable code I highly suggest it for future events.
I hate that we have to have a robust phone from a certain carrier, or a computer with a decent quality printer to enter the stadium after donations, ticket costs, and all the other BS we go through, but the printed ticket does work.