An easily packed and powerful resource, a smartphone has a thousand practical and imaginative uses when on the road or overseas. Download apps that map routes, manage foreign currencies, review restaurants, translate languages and much more. Use an app like PackPoint to make customized packing lists based on trip duration, weather forecasts and activities. iPhone and iPad users can plan their trip’s fashion ensemble with Stylebook, an app that allows you to mix and match your entire wardrobe using real photos. With What’s App, send SMS messages to and from anywhere in the world without paying extra fees. JetSmarter lets you easily search, request and pay for private flights, and Postagram makes and mails postcards with your own travel photos. SleepSounds HQ provides the noise that helps you slumber best with 600-plus options that range from a tumbling dryer to the sound of falling leaves.