I was just browsing the net, and i founs this: http://www.phonemag.com/blog/wp-content/gallery/nokia-5610-xpressmusic-on-t-mobile/nokia_5610_1.jpg
I read up a bit, and i found out that the T-Mobile version has no 3G. That's ok, but are there any differences, between the T-Mobile one and the original one?
Also, as you can clearly see from the picture, the music player is different. Is this just a skin, or is it due to some different software or something?