I experienced the Yondr phone prison last night for the first time (at a Chris Rock show). While I detest people being disruptive with their phones, I don’t think this is the right solution.
From a practical standpoint, it took a lot longer to get into and out of the venue when phones had to be locked up. Checking your phone when you pop out to the toilet meant waiting in a queue to have your phone unlocked, and being kept in a small penned off area. There have been a number of times when I’ve been split up from friends at large venues - not being able to text each other to meet up is inconvenient.
It doesn’t work. Unless stewards are doing a thorough search (which would be offputting in itself), people will manage to bring phones in. They did last night. Mine got locked up, my fiancées didn’t.
In the event of an emergency, this is a really bad idea. At the extreme end, you’ve got things like the Manchester bombing, where access to a phone would be a useful thing. But more likely it’s a fire alarm and subsequent evacuation, where you end up separated from your group. The venue last night (the SSE Hydro in Glasgow) said that in the event of an evacuation you should not attempt to have your phone unlocked but should leave immediately - sensible but if phones weren’t locked up, it wouldn’t even be a concern.
I think the solution is to simply enforce a strict “no phones during the performance” policy. Treat people like adults. If they break the rules, ask them to leave. Last night we were sitting in front of a very drunken, obnoxious heckler. After several people complained, she was asked to leave. This is how many venues handle it.
Interestingly, all of the venue stewards last night were wearing Yondr hi vis vests. They seem to be on a major marketing push. I really hope it doesn’t become commonplace.
The venue seemed to want to distance themselves from the decision, making announcements along the lines of “At Chris Rock’s request, phones will not be allowed at tonight’s show and will be locked in Yondr cases and given back you you. Consequently, Apple Pay will not be available tonight.”