What are main hazards of using mobile phone and hearing songs through mobile phones?

Question

What are main hazards of using mobile phone and hearing songs through mobile phones?

Answer 1

the signal given out by mobile phones can interfer with the radio communication on the flight

listening to music isn't actually the problem but phones cannot be turned on unless the have a flight mode (most sony ericsson phones have this) that allows you to listen to music on your phone without interfering with technology on the plane.