Sometimes, you just need an app to get through life. I rely heavily on my weather app, when I'm at home and when I travel, but one of my other favorites is Voxer. It's a messaging app that doesn't use up data like your texts do, plus it's free, so you don't have to pay for international texts when you go out of the country. It works with WiFi and it enabled me to send text of any length, pictures and even voice messages to anyone with the app. If you don't have a WiFi connection, you can still "send" them and they will push through when you do. I love this list of apps, especially TripIt, which I find invaluable every time I travel. The only app I'd replace is Yelp. I'd use TripAdvisor instead, as it is less biased and a lot better for restaurants and other activities, since it encompasses pretty much anything you'd do on a trip.