[Nobby]

Surely the mobile feature can't be all that it seems at first glance. If the 50 phones were really the phones belonging to the audience, they'd be getting constant calls and notifications, running low on battery, losing signal etc. All kinds of issues especially around privacy.

I suspect that the phones shown were just dummy phones (only three of them needing to be functional devices anyway) and the show has just extracted the phone directory from the real phones.

I wonder what the people being called received. I suspect a text message with a link to a webapp that starts their camera, maybe with a "Are you over 18 and happy to appear live on ITV1/STV now" prompt.