I use Cell C LTE for gaming, and it's pretty darn stable. 200ms for League of Legends (Europe) and around 30ms for local servers. Often beat out my friends on ADSL.
As a side note my signal is also quite weak, but the speed is constant and LTE never drops.
I use Cell C LTE for Steam and PS4 gaming. Works like a charm. Have never been dropped or disconnected. Have never had latency issues either.been using it for around 6 months now