out of curiosity, which country is this and how common it is among others? in Czech republic I am seen as a weirdo when I use around 10gb/month - most people are comfortable around or under 1 gb.
in CZ you can't get unlimited LTE plan AFAIK. The most expensive plans are around 30gb. Current speed in metro area is approx 70 mbit with a regular LTE phone without special antenna.
If I messed with my antenna setup a bit I could maybe get the speeds closer to 600mbit than the current ~100.
If it worked as well abroad that'd be amazing, but I'm sure the carriers will come up with some schemes to prevent that.