互聯網ＩＤＤ？

其實大致上都是要收費

現時比較流行的是用 skype,
http://www.skype.com/download/
這個更也行
http://www.jajah.com/

若只是插個咪入電腦傾的話, msn 也是最方便 ^^ (不用錢)
http://get.live.com/messenger/overview

you can type "internet phone" on the net and then download free software into your computer. You can also call your network serving company and inquire about the details.