Before you leave, buy an unlocked quad cell phone for ~$25-75.00 USD on Ebay. When you get to a new country, buy a sim card; $1-25.00 USD based on the country plus free minutes. We have paid less than $0.02/min to about $0.10/minute. You can also use the same sim card for data. Skype, as Marin suggested is there, but bandwidth can be a problem. Outside the US, everyone has a cell phone since there are few landlines.
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