verizon galaxy 3 to t-mobile?

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http://forum.xda-developers.com – hi, guys i just bought a brand new sgs from craiglist and the guy said it was unlocked to tmobile but i think he lied althought the phone is great in perfect working condition...my t-mobile sim card is not activating the phone. is it possible to get this phone on working tmobile's network? i been searching couldnt find a answer. (HowTos)