Goingtalk

Make and receive international calls at very low rates, from any phone, even without an internet connection. Every year, millions of Latin American tourists and immigrants face the same problem: to stay in touch with their family and friends. Although messaging apps works great and usually are free, they are no substitutes for a Voice call, especially when talking about immigrants. Roaming rates are highly expensive, international calling cards aren't trustworthy or transparent (a customer usually gets only 60% of the advertised minutes), and VoIP services like Skype are great, but require a good internet connection. Goingtalk is an evolution of the traditional calling cards and VoIP apps. You can make international calls directly from your contacts list using your data plan, or if it's not available, the call is routed through your voice minutes.