JustVoIP is one of several companies offering a unique approach to get your attention: They offer free calls to a number of countries.

The catch? Those calls are limited to one minute. ("Hi Mom. How are you? How's Dad? Yeah, things are fine. Bye Mom.")

There are other companies that offer the exact same feature, and advertise it with the exact same ad. So we suspect that these companies are related, and all probably work in the same way (though the proxy server my differ).

It's not a bad way to try out international calling using RF.com from your iPhone.

In the RF.com settings, just enter your JustVoIP user credentials (user name and password) and for the proxy server, enter:

sip.justvoip.com