In fact, the CAA says it is. Airlines would do well to train their crews to make sure "intentionally transmitting devices" like cell phones, remote control toys and two-way pagers are operated in their "safe" modes, the agency said in a recent circular.
So in addition to everything else they have to do, the crew must physically check each phone being used? How else can you tell if the person is playing a game or about to send a text?
Looks like the last haven of no mobile phones is being slowly eroded.