Can you suggest a tmobile cell phone that is good for mp3s?

Samsung Beat (T539)

There are a variety of phones you can chose from, depending on what kind of style you like. You can't go wrong with the new Sidekick, perhaps even the Shadow, although battery issues are well documented. I personally prefer unlocked phones that you can buy online, especially any Sony ericsson phone. Just find a model you like and use that, most phones have expandable memory now a days

Although i think At&t is the best cell phone company, my cousin has the sidekick slide and its a really good phone for putting mp3's on.

ouch. I would switch to verizon, they are the masters of the music centric and music features. The new motorola rockr is awesome. I have the LG venus from verizon, its godly good for music. It is the next generation version of the chocolete 2.