What do you travel with? I load my iPhone (whichever version that I have at the moment) with a bunch of apps. Compass - I use this a lot surprisingly, this is native on iOS. Maps - native on iOS, I also bookmarked Google Maps as an app since Apple's solution is subpar at the moment. TripAdvisor City Guides - offline guide for the popular cities, pretty good list. This app is good enough that it's replaced my need to buy LonelyPlanet apps and guides. TripAdvisor - when I have data Yelp - I find in North America, Yelp reviews are awesome, not so much in EU, requires data. CityMaps2Go - offline maps, some attractions with summaries from Wikipedia for free, or full Wikipedia article if you purchased the add-on. I got this app for 99c. It has all of the OpenStreetMaps. Kayak - tracks my trips, book new flights and hotels. HopStop - does my transit routing, but requires data. car2go, Zipcar - you never know, having a car is good sometimes. I don't have Zipcar installed right now because its support for Canada is limited to Toronto or Vancouver. XE Currency converter - I never get rates as good as XE. But it's a good reference guide. Airbnb, Hotel Tonight, Expedia - and some other hotel apps. Kayak has slowly taken over booking duties.