I recently had an incident on Cebu Pacific.
A loud brash American was told as leaving Butuan to turn off his phone. He waved the attendant away as his call was important. She returned to the front as we were on pushback. Once taxying along the runway she returned and asked him a second time. Again his reply was to wave her away as it was an important contract.
As the aircraft turned around on the runway she returned, took the phone from his hand, threw it to the floor (5 pieces of mobile) and told him to continue the call when we landed in Manila as the safety of the flight was more important than any call.
Result!