Mobile phone interference
AIrbuss clearly wrote to pilots that there is not a proved relation on microwawes interferece on computers flyght control wahtsoever (done by mobile phones), however the use is cautelatively requested to be restricted. Personally I will be very bother (more than that computers) if someone use a cell phone on board.
Is not a restaurant, is not a club, is not a bar IS A PLANE! Enjoy the flight!