If you're paranoid, Skype might be your best bet
This is a good thing for privacy advocates, but may not sit as well with government and law enforcement agents, who see it as an opportunity for terrorists and other criminals to go undetected. Read more here.
Skype was one of the first popular computer-based VoIP services. It's now owned by eBay, and it allows you to make free voice calls and send Instant Messages from your computer to another computer. You can also pay a per-minute fee to make calls to regular landline phone numbers and cell phones through a service called SkypeOut. And there's also a service called SkypeIn, where you're assigned a regular phone number for your Skype account so people can call you from landlines and cell phones. You have to download and install the Skype program, which is available for Windows, Macintosh OS X, Linux and even Pocket PC.

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