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Since there's no need to register, build a friends list and keep the app open to use it, you can even make free calls to people who aren't on your contact list.
ENGADGET: Viber VoIP iPhone app: 3G calling, no registration, and totally free
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It lets people make mobile calls internationally for free to others who have downloaded the software.
FORBES: Rebtel Poised to Upend Global Communication
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Vonage has sealed a partnership with The Cloud, a U.K. national Wi-Fi network operator with over 7, 000 hotspots in airports, rail stations and pubs where handsets can be used to make free calls.
FORBES: Magazine Article
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Skype offers a service that lets you make free Skype-to-Skype calls or calls to regular phones in the United States for 2 cents a minute, or you can select from a variety of unlimited calling plans.
FORBES: Making and Taking Free Calls While Overseas
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In September he and cofounder Uri Raz released an app called Tango, which allows you to make video calls for free.
FORBES: Magazine Article
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The benefits of universal wireless coverage only become obvious once people use it to make, say, free calls from internet phones and other gadgets that have Wi-Fi radios.
ECONOMIST: City-wide wireless internet
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Like Sprint, it is letting its (postpaid) U.S. subscribers make calls and send text messages to Japan for free until April 10.
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Now, according to The Verge, iPhone users can make free calls using a WiFi connection, with no carrier data charges, or using their data plan.
FORBES: Free Calling For iPhones: Is This The Real Facebook Phone?
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Google stands to benefit significantly if more people start using its services to browse the web over sprawling, free WiFi networks, or make phone and video calls calls via free services Google Voice or Google Hangouts.
FORBES: What Would Happen If America Got Free, 'Nationwide' WiFi? Google Wins, Carriers Lose
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Today, Sanchez is cancer free, but when she needs help, she still turns to Cornejo who is happy to make house calls.
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