I bought an unlocked G900T for use on the AT&T network. I choose this over the the AT&T version of the phone because this one had some extra LTE Cat4 bands or something. Which in retrospect is kinda dumb since I don't even know what those are.
Anyway, the phone actually works great outside of some extraneous T-Mobile apps. The only thing I can't get to work is WiFi calling. When I try to enable it, I get an "invalid SIM" error message.
Does anyone know how to fix this problem, with or without rooting? (I have not rooted this phone, but I am open to the idea if it's needed to solve this problem)
Anyway, the phone actually works great outside of some extraneous T-Mobile apps. The only thing I can't get to work is WiFi calling. When I try to enable it, I get an "invalid SIM" error message.
Does anyone know how to fix this problem, with or without rooting? (I have not rooted this phone, but I am open to the idea if it's needed to solve this problem)
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