— Joskin the mobile net won't be good for real time play.. It might be stabile enough to some turn based strategy (or a card game lilke Heartstone).
What harms gaming most is the Latency and Data loss. And mobile networks are really bad on both. With a landline the latency can be around 20-60ms (and with 100% data), mobiles generally may have 10* longer delays and a lots of spurious packet losses.
I'd recommend loading Ookla Speedtest.. The same program is available both PC.s and mobiles (at least Android) so it's easy to compare the difference. And please remember that on some parts of the world mobile connections are downright awfull.