My friend got yelled at to get off the ride at HRRR at the end of the night at HHN because they could see his phone in his pants. We had to wait 4 cycles to ride. Tbh, it's a bit much. I understand they don't want to be blamed if people lose their phones on the ride and having worked the ride, I know it used to happen a lot, but I always thought it was a "bring items on at own risk" type deal, which Uni is still covered. It sort of just pisses people off when you single them out and tell them they can't ride because they have their phone or something in their pocket.
It also reduces capacity if they are consistently stopping the ride to do this throughout the day.