T-Mobile uses LTE bands 2, 4, 12, 66, 71, while the G710EAW, which I assume is the model you've bought, supports bands 1, 3, 5, 7, 8, 28, 38, 39, 40, 41 - so none of the TMob LTE bands.
There are six variants of the G7, G710EAW is aimed at Asia/Oceania and together with the G710EMW (64GB/8GB...