International mobile calls can be fairly expensive while traveling overseas due to exorbitant roaming rates. Thankfully, the ubiquity of the Internet, even in the developing world, offers travelers a number of low-cost options for calling friends, family or business contacts at home.
A number of VOIP apps such as Skype offer free calls through the Internet over WiFi. Other options include using free hotspots for cheap WiFi, using local temporary mobile numbers, international calling cards and innovative services such as Google Voice virtual numbers.
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6 cheapest ways to stay in touch overseas