I Just got my 7105t lunlocked. I had called T-Mobile and they sent a request to get the unlock code. I got a reply in 24hrs with the unlock code.
For the Pearl, T-Mobile initially told me that I had to have it for 90 days. But when I told about the 7105t (on the same family plan) they sent a request to get the unlock code. I got the unlock code & the instructions:
Press the Menu key.
Scroll to Options and press the trackball.
Scroll to Advanced Options and press the trackball.
Scroll to SIM Card and press the trackball.
Press the Alt key pressed and type MEPP2.
Enter unlock code.