U.S. International Calling Estimated at Nearly $24 Billion

About 25 percent of U.S adults make international calls, and of those who spend money to make such calls, the average spend is approximately $34 every month, according to Harris Interactive.

With an estimated 235 million U.S. adults, this works out to roughly 58.8 million Americans spending 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 percent), either a traditional landline service provider (42 percent) or a VoIP service such as Vonage (12 percent). Another 44 percent make international phone calls using their mobile phones.

About 25 percent of those who make international phone calls do so using their computer through software based services like Skype, while 20 percent use calling cards.

New Harris Interactive Survey Projects 58.8 Million Americans Now Calling Abroad and Spending $23.8 Billion Annually - FierceVoIP