Not sure if the author has been to many of the developing countries he's talking about. While network coverage in the US becomes very unreliable (and often 2G o

Not sure if the author has been to many of the developing countries he's talking about. While network coverage in the US becomes very unreliable (and often 2G or slow 3G) if you leave cities&interstates, the network in many Asian countries seems to be rather more reliable. Perhaps it's because there has never been a 2G network, they started with 3G/4G. So far, Google Maps offline has helped me most on trips through the US.