Google has introduced cheap international calls online. You can make phone calls to all countries in the world at very low rates.

Anyone with a gmail account will be able to to access this feature. You do not need to use a Mobile phone, you will only Use an internet connection and microphone to make calls.

Some of the features include

Personalized greeting
SMS to Email
Cheap internet calls
Blocking callers
Conference calling
Number porting
Voice mails
Cheap International Calls
Call forwarding
Call recording

and so many other features

You will have to install Voice and Videao chat from your mail account. It Requires Windows XP+ / Mac OS X 10.4+ / Linux

To get started, you must be signed in to chat and have the voice and video chat plug-in installed.

Simply click the Call phone link at the top of your Chat roster to open up the Call window.

From the Call window you can dial a phone number, view your call history or add credit if you’d like to place an international call.

If you are in the US, the services gets better, there are free phone calls for all those in the US. This provides you with an opportunity to make free internet call