Do I need a non-carrier edition of a phone to properly tether without rooting?

I recently purchased a used LG G4 (H810 - AT&T version). I couldn't pass up the $180 price. I am on Straight Talk in the USA with an AT&T SIM. My previous phones have been nexus devices or unlocked non-carrier models. I have always been able to use the built-in Android wi-fi tethering. I don't use a lot of data, but I do need to tether occasionally. This is my first carrier-branded device on Straight Talk. Being an AT&T phone, they do everything they can to block tethering. I have tried countless apps on the phone, along with ones that do a USB tether with a PC. (ClockworkMod Tether, PDANET) I have not been able to get anything to work. This particular model is NOT ROOTABLE. Have I made a mistake buying this phone? Do I need to get an international unlocked edition if I want to do wi-fi tethering? I really like the phone and the camera is great, but not being able to tether is very dangerous in my profession as I am on-call 24/7.

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