Make phone calls over the Internet using VoIP

A growing number of people are using the Internet to make inexpensive or free phone calls to places all around the world. These people are taking advantage of a technology called Voice over Internet Protocol (VoIP). Skype (skype.com) is a popular program for making phone calls on the Internet, and you can download a free version of this program that runs on Windows Mobile devices.
Skype requires a high-speed connection to the Internet, so it works best with wireless LAN connections or 3G data connections from services such as Verizon, Sprint, and AT&T. If you use Skype on a device that has built-in wireless networking, it needs at least a 300 MHz processor. If you use an external wireless card, the device’s processor requirements increase to 400 MHz.
From Frank McPherson's "How to Do Everything with Windows Mobile"
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