and multiple phone calls are one of the main issues in the centers right now... customers are never happy if they have to call back even if it's an unrelated issue so while not required it is very highly recommended to use a different phone
there will be a ton of changes coming in Q1 as to how tech calls are handled, including updated content in the form of self help on tmobile.com, e-mail ts steps (pda first, then tech, then maybe even care), and a focus on true one call resolution
from what i've heard the changes will be major and will benefit customers quite a bit
oh and to the OP... you can find almost any ts step for your bb on blackberry.com... just search your issue (basically a primus just for bb)
also if you are having e-mail issues go to myt-mobile.com, bottom of the main page, click on manage blackberry e-mail... send yourself the service books (corrects a good number of delivery issues)