The first point isn't exactly correct, as you are allowed to read a magazine, but not a kindle. The rule is like the signs at a gas station telling you not to use your cell phone while refilling - its based on FUD, no science at all. Someone somewhere is scared of cell phones and fear they can do all kinds of nasty things that just aren't possible.
If there is an emergency on take off or landing, your fate most likely is not in your hands. Besides, if the plate starts free falling I'm pretty sure the guy listening to music will notice.
In flight you cannot get a cell phone tower signal, as cell phone towers do not aim up at all, just out. They are all directional antennas. I've accidentally left my phone on during many flights, and have no signal at all up there. During the landing approach I've received text messages while about 50-100 feet off of the ground, but no higher.