Calling Codes - an international calling code and country code directory
Cellular Resources - a resource for pre-paid wireless products for use in over 140 countries around the world
iCallAbroad USA plan - a source of domestic calling plans, US to US and US to international
iCallAbroad.com - a source of international calling plans, international to international and international to US
Mobal Phone - a provider of international cell phone rentals
Travel Insider - a source for cell phones that will work everywhere in the world