VoIP (Voice over Internet Protocol)

Phone of The Future (Newsweek article)

Free Public Hotspots: Callers can take advantage of the rapidly growing number of free public hotspots to make and receive low-cost calls when they are away from their home or office. Travelers can save by making calls from airports and hotels around the world.

Vonage.com - Help - FAQ - Wi-Fi

Where can I get the Vonage Wi-Fi Phone?
We are currently completing a Wi-Fi Phone Beta trial and expect to launch service to all customers by 4Q 2005.
Can I use the Vonage Wi-Fi Phone at a local hotspot like Starbucks?
No. Starbucks, hotels, airports are considered a type of Wi-Fi hotspots. They provide an open access point but require a login and password to access their service area. For the initial beta trial we do not support these types of interfaces.
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Can I use the Linksys Phone Adapter Overseas?
Can I use the Phone Adapter overseas?
- Currently we do not sell our service internationally (except Canada and the United Kingdom) and therefore do not ship internationally or accept international credit cards. However, our service will probably work in other countries. We advise you to check the local VoIP laws of the country that you are using it in because some countries regulate the use of VoIP. Unfortunately, we cannot guarantee the quality of service due to the long latency between your local ISP provider and our service in the United States. If you use our service in another country, you will have to accept a U.S. telephone number and pay our international rates to call within your country. See our current list of international rates.