https://fixyourandroid.com/apps/android-voip-apps-free-voip-calls/
List of top free VoIP Apps for Android. All the apps listed here are free to use but in order to use extra features, you might need to pay for them. Still, it's you can find several VoIP apps that are completely free. Also, don't forget to check the apps section for more useful apps for Android.
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