In theory one could use disposable sim cards, but they're easily traceable and even if you rotate the cards very frequently, it'd still be easy to pinpoint who

In theory one could use disposable sim cards, but they're easily traceable and even if you rotate the cards very frequently, it'd still be easy to pinpoint who and where you are. The logistics is also infeasible. But I wouldn't trust TG on that area either. If a government really wants to, they can certainly exploit encryption flaws in the TG protocol and get you. Not as easy as tracing SIM cards, but definitely possible and within govs reach