Unlocked Tmobile using on ATT

[tag387@yahoo.com]

I have an unlocked tmobile sgs3 that has a a few tmobile apps on it. States I cant uninstall them unless a factory reset is done. Does anyone know if I do a factory reset will it put it back to tmobile. It works fine but just want to get rid of the tmobile apps. I have the code that was given to me by the place where i purchased it from.

Thanks in advance