I think it's Google Maps. Android version is far more useful to average user and people using it for navigation will really suck down data (there are quality n

I think it's Google Maps. Android version is far more useful to average user and people using it for navigation will really suck down data (there are quality nav apps on ios but they cost a lot while Google Maps is stock on everything). Anecdotally, I turned on Google Maps for like 10 min in Iceland and ate a $100 roaming fee.