Remember roaming charges? Neither do I. So I wasn't particularly thrilled, when a couple of hours into our weekend trip to Zürich, I hit the roaming ceiling (€60 wasted), and my carrier conveniently disabled mobile data. That caught me completely unprepared, and I would have been royally screwed if it weren't for Organic Maps. Actually, I had the app installed on my Android device for quite a while, but the force of habit kept me using Google Maps.