Turning Off Your Phone
While it is extremely unlikely that phones can cause problems in today’s planes, the chances are not zero. The reason for turning off your phone is more of a social than a technological issue. Consider that every 200 passengers on board are chattering on their cellphones or listening to loud ringtones…

Airlines hide their policy of limiting mobile phone conversations on planes under the guise of preventing technical difficulties with the aircraft to prevent such problems. There have been airplane disasters where cellphone interference was a possible cause, as previously stated.