There have been many services offering free international VOIP calls and most of them rely upon ad-supported funding to get things going, most of such services have closed there doors but there are still a few left. One such service
Evaphone allows users to enjoy
free international PC-To-Phone calling from there website (or any other flash supporting device) to any landline or mobile
phone in most parts across the globe, the service supports almost all major countries of the world including USA, UK, Canada, India, Pakistan etc. with each country having a fixed single free call duration with unlimited numbers of calls.
Received Call Proves Service Works As Advertised Calls Can Also Be Made From Any Adobe Flash Supporting Mobile Device To get started with free international
landline and mobile phone calls simply point your web-browser (from your PC or flash supporting
mobile) to
EVAPHONE.COM, a list of all supported countries with
free call duration limit can be
found here.