> This advice is pretty stale: 3G is rather old by now – 4G came out in 2009
When traveling to places with 4G or LTE coverage I'm often downgraded to 3G or edge. My parents' home has mostly 2G/edge connectivity, with some spotty 3G coverage on the second floor. They're "only" on the outskirts of a greater metropolitan area.
Just because some tech is old doesn't mean it's not very much still relevant.