My current carrier is Ben, which makes use of the T-Mobile network here in the Netherlands. Now in the added screenshot you can see it displays TMO NL; which I guess refers to t-mobile.
But it should be displayed as "Ben NL", and so it did after installing CM9 R3. Then I installed your pdroid script and now "Ben NL" changed to TMO NL, as can be seen in the added screenshot.
In reaction to your edit: I think I used the right script, just downloaded and flashed it this morning..
Edited by wouterbeer, 25 November 2012 - 12:48 PM.