Many smartphones are WiFi-capable, but that doesn't necessarily mean your carrier will support WiFi for voice calling -- particularly if you bought the phone elsewhere. You can use a Nexus S purchased from Best Buy to surf the Web on any WiFi network, for example -- but not to make voice calls. That can be a problem if you spend much time in an area where your carrier's cellular coverage is weak. The answer? VoIP. If you live or work in an area with marginal cell service and want to use your Android smartphone to make and receive voice calls, you can. The key is to piggyback on an Internet connection at your location using the Internet bandwidth there to carry your voice traffic. This method of calling works using Voice over Internet Protocol technology (VoIP) -- a form of calling over computer networks without traditional telephone copper wire. You are abandoning your lackluster cellphone signal and routing your voice traffic over a WiFi router, and down into the depths...
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