Have smartphone, will travel: How far can you get with just passport, wallet and phone?

Sure, you know your mobile phone is essential, but exactly how much can you rely on it? A few days ago in Japan, Google threw down a gauntlet: how far can you get in a foreign country, where you can't be sure of finding an English speaker, where the words, even the alphabet, are unfamiliar, and where the address system is notoriously tricky? So there I was, in Tokyo, charged with solving a series of puzzles using a smartphone and nothing more. First, I had to get myself from bustling Tokyo (where English speakers are plentiful and, because they are Japanese, endlessly helpful) to the distant city of Kanazawa. I had a JR train pass, which is the best way to get around Japan for a foreigner and which offers fantastic value, though you must buy it before you arrive in the country.