What app can i call internationally?

I have an iphone and i'm looking for an app that i can call internationally free with no extra costs please help thanks.

There's a free app for the iPhone called Viber that will allow you to talk internationally. With it, you can call and text anyone else who also has the app downloaded on their phone as much as you want at no cost. However, you must have a Wi-Fi connection in order for the app to work.

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