How-to: Unlock Code for Blackberry Pearl

I currently have a phone that is not being used and it is a T-Mobile Blackberry Pearl 8100. It has no service on it. I currently have AT&T as a provider and can't afford a new phone. Mine broke and I found my daughters old T-Mobile. Can anyone help me with a unlock code for this phone. I can't afford to pay for a code due to not working until the kids return to school. My cell phone is the only contact I have with my husband at work. I really need it for emergencies.

Thank you in advance for all help!!!

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