VoipBlast

VoipBlast offers a simple tool for OS X to make cheap phone calls.

Download the installation file
Double click the file you just downloaded
Install the client and create an account
Enjoy cheap and free phone calls.

Download Mac Client

make a free* trial call

Enter both phone numbers in the international format, for instance: +442012345678.

Free calls are limited and only valid for landlines in destinations marked as free.

More instructions.

rates calculator

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*Free calls are limited and only valid for destinations marked as free.
**Free calls are limited to certain cities