Hey so I have used my 4G and Hotspot on my phone to game before. (League of legends to be specific) and never experienced lag issues. I even used it on two computers at once with my gf on the other. I upgraded to the unlimited plan and now I get random Extreme slow 4g even when Im just on fb ect. And while gaming get lag spikes and spam dcs. But it is random and it will be fine for a few days but then decide to lag in the middle of a game that was going just fine.