textPlus is the easy way to stay in phone contact after crossing a border. All textPlus users can call or text each other for free anywhere in the world. What’s more, the app can be used to place international calls to any phone at rates lower than even Skype’s. All that’s needed is a Wi-Fi connection. (Free, iOS or Android)
XE Currency provides a calculator linked to real-time currency rates—“so you know just how many euros that gelato is costing you.” (Free, iOS or Android)
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