According to the study, 1 in 4 U.S adults make international calls, and of those who spend money to make such calls, the average spend is approximately $34 every month. With an estimated 235 million U.S. adults, this works out to roughly 58.8 million Americans shelling out nearly $1.98 billion on international calls outside of the U.S. monthly and $23.8 billion annually.
For adults who make international calls, the majority do so using a landline (51%), either a traditional landline service provider (42%) and/or a VoIP service such as Vonage (12%). Another 44% make international phone calls via their mobile phones, through carrier calling rates (25%), special long distance packages (20%), and/or a VoIP service/application (9%). Another 25% of those who make international phone calls do so using their computer through software based services like Skype, while 20% use calling cards and 4% use something else.
Read more: New Harris Interactive Survey Projects 58.8 Million Americans Now Calling Abroad and Spending $23.8 Billion Annually - FierceVoIP http://www.fiercevoip.com/press-releases/new-harris-interactive-survey-projects-588-million-americans-now-calling-abroad-and-s#ixzz14iNb8ijQ