new to phone and rooting...

I have a galaxy s4 that I bought new and unlocked. It was an AT&T phone adn I am on t-mobile. Unfortunaley the mobile hotspot function will not work ("mobile data is not avaialbe or invalid sim card"). this is a problem with unlocked at&t phones, apparently and I really need this function.



So I...



new to phone and rooting...



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