Question about Unlocking my Samsung Galaxy S3 that is on the AT&T network!

[CRASHTM]

Hello there, I currently have a Samsung Galaxy S3 that is on the AT&T network. I have rooted it and installed a custom rom on to it. It is currently running cyanogenmod 10.1. I was wondering, If i wanted to switch to T Mobile if I had to do anything else in order to take my phone to their network. If so what would i need to do? As I look forward to switching to T Mobile to get access to the unlimited data that they offer. Any assistance would be greatly appreciated!
Please and Thanks
-Crash?

 

[CRASHTM]

Not a single person has an idea on how i might go about doing so?

 

[atheistatic]

Let me google that for you

Click the first link...