I want do know something like any phone that you can use on computer ?
Answers: There are copious VoIP services that offer "free PC-to-PC" calling. Examples are Skype, Yahoo Voice, Windows Live Messenger, Gizmo Project, WengoPhone, MediaRing Talk, and Google Talk. No money is needed to articulate PC-PC.
I have a trellis site on this subject, called "CQ VoIP Call" (link is surrounded by my profile).
Any services that advertise free call to PSTN land phones is usually one and only introductory offer or near limited usage or have fine print that most people aren't aware of until after the sign-up....
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