Over here we ask you to turn the phones off nicely then if someone doesnt comply the FA's are under instruction (we go over it during briefing) to confiscate the phone and not return it until the passenger is leaving the aircraft. Should there be a problem then we either dont leave the gate or reurn to the gate where the problem child is escorted of the aircraft by waiting police. I/we have zero tolerance for people who dont comply with crew member directives....if you dont like it then dont fly.
MS