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on gsmworld.com I found the following info for T-mobile
USA
T-Mobile USA, Inc. - Network Information
Network Information | Roaming Partners | Services | Coverage Map | Web Site
Operator Name T-Mobile USA, Inc.
Network Name T-Mobile USA
Network Type GSM 1900
Handset Code TMO
Network Code 310 16,20,21,22,23,24,25,26,27,31,58,66,80
Network Status Live February 1996
Back to USA
Which network code do I need to use to unlock? this is not even funny, haven 1 or two choices is great but this!!!!
you can just give the operator (t-mobile) and country(uk etc), this is enough to calculate the code from the imei.
most of the programs need a network code to calculate codes, so it is better that people who want unlock codes will know their network code.
yes, you do need the network codes, but the programs have country and network selections so it gives you the network codes.
some programs, like yours, have the country/network selection. but some others, like the one i used to work with don't, so to make it easier for the ones that calculate the codes it's the best if people who want codes will know their provider code.