Wikipedia
Based in Lexington, Massachusetts, iBasis is a wholly owned subsidiary of Royal KPN, N.V., the Dutch incumbent telecommunications carrier. iBasis is a wholesale carrier of international long distance telephone calls, with enhanced services for mobile operators, and a provider of retail prepaid calling services. In Fiscal Year 2010, iBasis had total revenues of $1.2 billion, carried approximately 24 billion minutes of international voice traffic, and employed approximately 370 people.
More than 1,000 mobile and fixed line telecommunications carriers and service providers worldwide outsource some or all of their international voice traffic to iBasis. It is one of the largest carriers of international voice traffic in the world. iBasis customers include many of the world’s largest carriers, mobile operators, and emerging service providers including Verizon, Vodafone, VSNL, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica.
The company also offers online pre-paid international calling services to business and consumer customers through a product called Pingo.