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Many of these apps for calling abroad will work without WiFi as well.

There are several apps that allow you to make free internet calls for mobile devices, tablets, and computers. VoIP stands for “Voice over Internet Protocol” and simply refers to the call happening over the internet instead of via a traditional phone plan provider. One great way to keep in touch with others while abroad is through a free VoIP caller app. How to make international calls for free or cheap from your phone or laptop So, what's the cheapest way to make international calls?.How to make international calls for free or cheap from your phone or laptop.