Making free calls via a mobile phone is very easy.

"A killer application that would change the way we communicate on
mobile" is what i would call it..
An Israel based privately held mobile application developer company,
who recently launched a free application. Its a mobile voice over IP
application that allows you to make free mobile calls and send instant
messages.It also integrates with Skype, Google Talk, MSN. You could
check out the video, where the application is demonstarted LIVE. Enjoy
and post in your comments.

http://askwiki.blogspot.com/2007/12/...-phone-is.html

Good Day!!