Save on phone calls with a mobile phone

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Hey gang, I heard a friend complaining about their phone bill. This is just one company that I found. Does anyone know of anyone better? Leave me a comment if you do.
From the company:
PingoMobile routinely saves customers 90% or more on international calls from mobile phones, even compared to international cellular plans, and it works with any phone carrier! Pingo offers international access in 35 countries, so customers can save on calls all over the world. Plus, customers can share their Pingo accounts with friends and family.
Mobile users save 90% or more on international calls with Pingo!

Pingo: Fantastic Rates on Domestic and International Calls and Access from 35 Countries!