hi

Call T-Mobile customer service and ask them for the unlocking code for your phone.

And, next time you have a question, please use a more meaningful subject than "hi" and post in the correct forum. "Series 90" applies only to the 7710 and the 7700 phone models, and there's an obviously better forum for N95 questions, if you just bother to take a look at the list of forums here. Hint: it is named "Nokia N95".