I am by no means an expert on how LG typically builds their devices but I would imagine that TMO devices if properly sim unlocked would work on ATT. Again proceed with caution as I am not saying it will work.Saw that as well. I am on at&t and have no intention to switch - do we know if the t-mo g4 will work on at&t and if the t-mo version will have an unlocked/unlockable bootloader? Would there be any missing capability by using at-mo g4 on at&t network? If its good to go i will pre-order from t-mo and use on my at&t account for sure...
I am switching from Sprint to TMO when this device hits so I am excited to give them my money tomorrow.