I agree. I'm an adult, if you ask me to not use my phone I will comply. If other adults can't do the same, then simply ask them to leave.

Yondr feels patronising, almost like we are being treated like children.

That being said, I generally don't go to gigs anymore because its getting more like flying. Expensive tickets with hidden fees, being forced to queue neatly like school children, searches, and then the overpriced food and drink. This is just one more thing to add to the list.