Phillly, with Cingular, your friend may have better luck if he tells them he has to travel internationally. I am SO HAPPY I left them seeing as they hardly support ANYTHING related to the BlackBerry.
Frenchky, just follow the instructions in posts #1, 8 and 9, and you will be able to unlock your BlackBerry. It's simple and takes less than 5 minutes once you get the code.
I was going to unlock my 7100t and my 7730 but I don't have 3 different active lines.