Just a quick count of cell phones T-mobile offers on their web site today:
- Nokia: 9
- BlackBerry: 11
- Motorola: 10
- Samsung: 10

There are some "T-mobile branded" phones as well... but I didn't count those.

Overall Nokia is fairly evenly represented there based on model count. Only that all Nokia's are "free" and BlackBerries the most expensive...

No Nokia premium (N or E series) phones are there.