Default Blacklisted, but unlocked, T-Mobile Galaxy S5 on AT&T

I'm thinking of buying blacklisted TMo GS5 (because of the unlocked bootloader & also because it's cheaper to get a blacklisted phone becuase of the stigma), if I were to unlock it would I be able to use it on AT&T or it's MVNO's? Has anywhere sucessfully tried it? Thanks,