The following 4 services will help you to make free calls to different countries (nearly covers all countries in the world). Check each service and make your free calls. Some of them are special offers so visit and get that now itself.
Most of them are using PC to phone while some of them offers mobile phone application, using which you can make free calls from your mobiles.
1. EvaPhone
EvaPhone provides Internet telephone calls for free. They offers free VoIP call solutions: free VoIP service lets you make PC-to-phone free international calls. All you need is a computer to start making free VoIP calls using Internet to phone.
This site offers different duration for different destinations, for example for USA it is 60 Seconds while for Vietnam t is 16 seconds.
See the available destinations and duration of free calls here. After getting disconnected you can call again.
Read more and make a free phone call
2. PennyTel
PennyTel offers free calls to Canada, China, India, Hong Kong, Singapore and USA. For the following countries they offer calls excluding to Mobiles and special numbers Australia*, New Zealand* and UK
From 1st December 2010 to 8th January 2011
Visit the promotional page, Create an account and start making free calls to Canada, China, India, Hong Kong, Singapore, USA, Australia, New Zealand and UK
If you are using Nimbus, you can read how to configure nimbus to make free calls using the pennyTel credits here
3. Goober
Goober offers first 2 minutes of each call are free (to all countries in the World Flatrate)
The first two minutes are credited to your account after the call each time. This refers to the following countries:
Mobiles and landlines in:
Canada, China, Chile, Hong Kong S.A.R., Malaysia, Singapore, Thailand and USA
Landlines in:
Argentina, Australia, Austria, Belgium, Bulgaria, Colombia, Croatia, Czech Republic, Denmark, Finland, Estonia, France, Germany, Greece, Guam, Hong Kong S.A.R., China, Hungary, Ireland, Israel, Italy, Japan, South Korea, Luxembourg, Netherlands, New Zealand, Norway, Poland, Portugal, Puerto Rico, Russia, Singapore, Slovakia, Spain, Sweden, Switzerland, Taiwan, Thailand, United Kingdom and USA
Read more and make free calls to all countries using goober
4. Localphone
Localphone is offering free calls to Spain landlines
To help you celebrate over the festive season we’re giving away 100% free calls to landlines in Spain—no strings attached! This offer is available to all customers, new and old, and will expire at 23:59 GMT on 31st December when it will return to our low standard rate of just 0.8p per minute.
Read more and make free phone calls to spain - localphone