Benefits: Not only can you call your online friends for free, VoipCheap also offers free calls to any regular land-line in various popular destinations
Andorra
Argentina
Australia
Austria
Belgium
Canada
Chile
Czech Republic
Denmark
Estonia
France
Germany
Hong Kong (+mobile)
Hungary
Iceland
Ireland
Italy
Liechtenstein
Luxembourg
Malaysia
Monaco
Netherlands
New Zealand
Norway
Poland
Portugal
Russian Federation
Singapore (+mobile)
South Korea
Spain
Sweden
Switzerland
United Kingdom
United States (+mobile)

VoipCheap is a softphone that you download and install on your computer; Mac OS X and Linux users need to setup with a SIP compatible softphone using settings supplied by VoipCheap. Another interesting feature is  you can send free SMS text messages to your contacts, where available. You can not go wrong, countries with free calls are clearly marked and it’s very well established.
Because VoipCheap uses the open SIP protocol there are lots of third party devices that are compatible with it. If you have a SIP enabled VoIP phone, router or modem then it is possible to seamlessly integrate the VoipCheap service in your home or office.
Not all calls are free. If you have to regularly call a contact located outside the list of free destinations, then you will have to buy a credit.
For example: calling india from usa is 0.07 cents

VoipCheap have a Fair Use Policy that states Max 300 minutes per week of free calls, measured over the last 7 days and per unique IP address.That makes 5hrs/week Which is more than enough  to keep in touch with family members or business associates.