I have seen an LH FA walk up to a Pax yakking on a phone, snatch it out of their and flip it shut. The Pax was told to turn it off three times prior to this event.

After the door shut, as we pushed from the gate at JFK, once or twice more on taxi, and then as we made the left turn to the runway she walked up, grabbed it out of his hand and snapped it shut. He was pissed and yelling at her, she just walked off with the phone.

I say.....Good For Her!