Where are all the plane crashes caused by someone leaving their cell phone on? Heck, where is even ONE plane crash? For that matter, where is ANY pilot that got on the loud speaker and said, We are receiving interference on our radio, someone has a cell phone on and would they please turn it off. For all the flights that happen every day in every country of the world, I am not aware of even ONE crash or even ONE emergency landing due to a cell phone. I was told by a pilot once that this whole cell phone thing started when airlines started putting built in phones in the seat backs that charge around $1 a minute. Why would anyone want to use the airline phone if they had their own cell phone. Not saying 100% that this was the real reason, but if you check the dates, you will see that airline phones came out the same time as the cell phone ban.
Even though most airlines discontinued the use of airline phones, if the airline ever came out and said that the cell phone ban was only done to create more profits for the airlines, the ensuing law suit for anyone that ever used an airline phone would bankrupt the airline.