Im a teacher and more effort needs to be exerted by schools to eliminate cell phone, ipod and MP3 players at school. Leave the kids' fashions, their hair, what they wear, alone.
I believe school officials focus on what is easiest for them to deal with rather that what really needs to be addressed and would be most effective. They have to justify their positions and appear as if they are doing something, with the least opposition from parents and students. Students learning is NOT at the forefront of their decision making.