MaxLV: After all they do contain a Lithium battery, and we all know how dangerous they are, dont we. (Just ask Boeing)
If you ship a lithium battery anywhere it requires special packaging, special delivery instructions, etc... and yet you can carry them on to an aircraft in a cell phone.
Safer in a pressurized cabin than in depressurized cargo, no?
If electronic consumer devices (not just cell phones) are risky on aircraft, why are you allowed to use those devices once you're in the air?
If RF interference could cause momentary failure of flight systems a failure during take off/landing would be a major problem. A failure in air not so much, there's already plenty of lift and plenty of space to manoeuvre/recover.