Affordable overseas calling with smart phones

The New York Times ran an excellent article on January 7, 2010 by Joanna Stern on linking cell phones and smart phones to Internet based calling services for affordable overseas calls to the US. Titled "Cheap Mobile Calls, Even Overseas' this is very useful information. Here is the link:

http://www.nytimes.com/2010/01/07/technology/personaltech/07basics.html