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Mobile modem/router. My particular model is the M2000, with a T-Mobile sim that is tied to Calyx's account.

Calyx is a non-profit security research and internet provider that utilizes mobile modem/routers to connect associates to Sprint/T-Mobile as their primary service (but they do other good privacy-related work that no one cares about).

Back in the day Clearwire was a promising upstart cellular network infrastructure builder and provider in North America, and they had a clause that allowed non-profits to piggypank off their networks and have their users utilize them as they saw fit (enter Calyx and their sales to abuse this loophole while also funding their existing lawsuits and research). Sprint bought Clear out, but the clause for unfittered, unfiltered non-profit use remained. Years passed, and T-Mobile acquired Sprint in yet another modern day anti-trust violation. The clause still remained, and they hated that.

5g comes around and T-Mobile decides the clause doesn't apply to it, and they will throttle past 50GB, 5g was originally fast, but quickly became saturated with normies, so its a moot point and everyone switched back to 4g in router settings for unthrottled. They started video throttling, we switched DNS. They figured that out, we used VPNs. It got really bad for the last few months but apparently things are sort of fine again at an average of 7MBps down (vs the old 30+), but hey, whatever. T-Mobile wants to kill that clause, but they can't because it's ingrained in almost two decades of old terms of use that they acquired but cannot change; it requires a full network overhaul to null them out. Still, it's been a fight.

I know there are better options now, but neither know much about them nor much about their pricing schemes other than they're not much better price-wise than major carriers aside from being unlimited.

Calyx and the contempary alternatives for the most part do not work outside of the Americas. Pretty sure there are some European options but am not familiar. If you want Australia, then I guess the Starlink beta program is your best bet (if you can even enroll), and so far it both sucks for mobility and is expensive. There may be similar options abroad that abuse terms of the infrastructure's owners, but I am not versed in them.

All in all, aside from simply looking for relatively decent connectivity on the go, you'll find untold stories of kikery behind the scenes everywhere you look.

Edited this several times because drunk and trying to tidy it up.