How secure are those Internet phone calls?

SAN JOSE, Calif. -- The allure of Internet phone calling is understandable -- dirt-cheap calls to anywhere in the world, sound quality that's at times superior to the traditional landline and the ability to take your phone number with you when you travel.

But, buyer beware. These calls are just like any other form of digital communication, like e-mail, which can be hacked, spammed and saved on servers.

While Internet calling programs from Skype and Vonage to Google and Yahoo are getting more and more popular, security experts warn that they're not as secure as your traditional landline.

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