I responded to U2's request for comments and included my view that no airport could or would regulate mobile phones. I received this in reply:
I regret any inconvenience caused due to this announcement.
I have immediately escalated this to our airport team to get a clarification on the announcement. Please allow us sometime to check our details and we will get back to you.
We look forward to your continuing association with us.
I'll withhold my scepticism for some time. It will be interesting to hear what they have to say.