hi it will be helpful for me to guide you the exact place if you had specified the model of your mobile .however codes are the best solution to unlock your blackberry mobile from t-mobile network .to purchase codes visit mobileunlocksolutions.com here they ask you the imei number of your mobile .finally they send you codes to unlock your mobile and to get the instruction about how to use the codes in your mobile visit mobileunlockguide.com here they
provide free guide about how to use the codes.