It seems that cell phones with built in MP3 players and small speakers are becoming "the thing" these days. However, owning one does not give you a license to have your music blasting from your phone as you get on the bus or walk down the street.
I've seen people have their phone belting out music while they attempt to talk over it to friends right next to them, all the while a bus load full of students look on thinking the same thing "can a person really be that inconsiderate?" Most people are not in the mood to listen to your (insert annoying music of choice) at 8 a.m. on the way to class.
Come on people, learn some courtesy and use a pair of headphones like the rest of the world.