Skype allows you to make VoIP calls to other Skype users.
Through SkypeOut, it is possible to call any fixed telephony destination in the world (prices);
unfortunately the connection fee has been added lately.
With SkypeIn, you can have your own telephone number on which to receive calls even from landlines (for now not available for Italian numbers).
Skype also allows you to video call (using a webcam), and send SMS (for a fee).
Skype history available, for Windows, Linux, macOS: download Skype
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