In 2006 I had an extra Nokia dumbphone in my backpack just for Bluetooth tethering. Unlimited GPRS was cheap and the web was not yet shitty. I only had to charg

In 2006 I had an extra Nokia dumbphone in my backpack just for Bluetooth tethering. Unlimited GPRS was cheap and the web was not yet shitty. I only had to charge it once or twice a week even though I used it every day on the commute. But for maps/navigation, you could just use a tablet or laptop with offline maps (e.g. maps.me).