Yak4Ever just announced they are no longer offering the free international calling service from US phones. Their service was dependent upon earning money for each call from a fund set up in the US that subsidizes calls to rural phone exchanges.
Read more

Mobivox offers an advanced free global calling service. Set up a free account, all you need is a phone number (mobile, landline, etc) that is registered with the free service.

All calls made from your registered phone number are free. <...Read more

Get up to 30 free minutes of global calling from Adcalls. They offer 2 ways to make calls. Use their free PC to Phone dialer, or make calls directly through one of many local access phone numbers around the world.

Find a list of local acce...Read more

Schedule free unlimited conference calls with anyone anywhere in the world. Free global call services can be used to link callers from most any country in the world.

If you don't mind entering access codes and conference room numbers, you...Read more

Free calls to and from over 40 countries through local access numbers. When you want to call someone in another one of 40 Free Calling Locations, you request a local access number for the party you are calling.

To complete the free call, ...Read more

You get up to 1200 minutes per month for 3 months free calling to locations in 40 countries. If you make more than 1200 minutes calling to the free locations in a month, regular calling rates apply.

A prepaid deposit of at least $9.95 is re...Read more

Totally free phone-to-phone calls. Ad supported. You will have the ability to make an unlimited number of outbound long distance calls to and from over 20 countries.

Unregistered callers are limited to US phone calls with a maximum call dura...Read more

Make free 5 minute phone calls to over 70 countries including most of Asia and Europe.

Free International Callback from 8am to 8pm, calls limited to 5 minutes. You can also access the free service from hundreds of local access numbers arou...Read more

For about $15 (USD) per year, you can access the lowest calling rates on the planet to set up a toll-free calling line to receive calls from anyone on the planet.

The person calling you places a call to a local access number in many cities...Read more

For about $25 per year, people can call you from around the world for free, unlimited use. You receive the calls on your regular phone line.

All you need is a US working phone number (land line, wireless or virtual number), a Phonegnome acc...Read more

ViaTalk has launched a free service to make totally free 10 minute calls to anywhere in the US and Canada. You do not need a computer to make calls, only to schedule the call. From the ViaTalk web page, you enter the number you are calling to and fro...Read more

Google recently acquired GrandCentral and has limited the access of the great free service to new members. Now GrandCentral will let new members "reserve" their GrandCentral phone number, but they will not be able to use the number until the service i...Read more