This HowStuffWorks article explains how to make international calls easily and (in some cases) cheaply from landlines, cell phones, VoIP phones, and within conference calls.
HowtoCallAbroad.com is another helpful site that provides information on how to dial internationaly from the USA, Canada, or from any other country.
International Phone Directories
Using Your Cell Phone in a Foreign Country
How to Use Cell Phones in a Foreign Country from eHow and How to Use Cell Phones Abroad from USA Today are two articles that provide advice about how to use your cell phone will traveling outside the United States. For more information, consult your carrier's international calling web site:
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