Look man, they already gave you a solution, PAY FOR THE UNLOCK CODE or CALL T-MOBILE to see if they can give you the unlock code.
It doesn't matter what phone you have if you need a SIM unlock you will need to get it from somewhere because as someone else already stated, at this time there is no way to SIM unlocking the phone with the software that is available to us.
Other members here have you running around because you can not unlock this phone by just changing a ROM, not here and not on this phone.
Don't confuse the spoonfed blackra1n unlock and jailbreak software with something for android.
If you payed over $300 for the phone, you should be able to pay an additional $20 for an unlock code, or if you dont like that, learn the HTC method to unlock the phone.