"Its only a nav issue. There is no technical reason for not useing a cell phone in an aircraft, on the ground, in the situation described. End of story."
What about a Engine fire Warning, or Cargo hold Fire Warning on the ground caused by mobil phone ? ? ? ?
If there is risk of fire, a evacuation will be performed resulting in a fine ride on the avac. slides ! ! ! , and someone allways get hurt.
Besides, if passengers have been told not to, it is a breach of existing law, you are as a passenger supposed to do what you are told to do, and told not to do ! ! ! ! ! ! ! ! !
So do what you are told to do, or I will handcuff you, and deliver you to the local police. ( just kidding ! ! )
, but it is an option.