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22. WhatsApp
WhatsApp is a must-have if you're going abroad. You can use it to call and message your family back in the States via WiFi, meaning you don't have to incur long distance fees or buy calling cards. It also lets you and your travel mates message and call each other if you separate for an afternoon, where all you would need to do is pop into a coffee shop and use their internet to launch up the app.

Another bonus if you separate for a couple of hours: Once you're ready to meet up again, you can send everyone your location, and your recipients will receive a map that leads directly to you. So easy.