New iBasis GRX Service Supports Consistent and Cost Effective Roaming for Always-on Data Services

IP-Based Roaming Solution Provides a Single Connection for Mobile Operator Access to Expanded Data Coverage in More Countries with Predictable Pricing and Proven Quality

BURLINGTON, Mass – 09/29/2009 – iBasis (NASDAQ: IBAS), a KPN affiliate, today announced the iBasis GRX (General Packet Radio Service Roaming eXchange), an IP-based service that provides a single carrier connection to support always-on technologies such as mobile Internet access, multimedia messaging services (MMS), push-to-talk cellular, instant messaging, and presence. With the iBasis GRX Service, mobile network operators (MNOs) can offer their customers a consistent data experience while roaming internationally, cut operational costs and increase roaming revenues.

The iBasis GRX Service simplifies both the technical and contractual aspects of GPRS roaming. A single connection gives MNOs access to iBasis global infrastructure, and iBasis flat service fee and pricing are summarized in a single monthly bill, making costs easily predictable. iBasis 24/7 service experts manage the GPRS network and use the companys international relationships and bilateral agreements to negotiate the best carrier roaming rates, allowing MNOs to focus on their core domestic business.

The iBasis GRX Service includes key features for mobile operators:

  • High-quality, consistent customer access to data services
  • A cost-effective alternative to dedicated connections
  • Customized service level commitment
  • Secure and reliable transport with predictable operational expenses
  • Access to iBasis Premium Voice products and IPX network
  • A future-proofed offering that will support tomorrows IP-based services

For mobile operators, data services represent one of the largest opportunities for growth, and their customers expect to be able to access these data services no matter where they are, said Ajay Joseph, chief technology officer at iBasis. The iBasis GRX Service gives end-users the high-quality, consistent access they want, while reducing costs and management complexity for mobile operators. And as new data services emerge, service providers can rest assured that iBasis future-proofed infrastructure will support them.

The iBasis GRX Service is part of the iBasis Mobile Matrix portfolio of value-added services. It is deployed on the iBasis Network, one of the worlds largest international IP networks, and provides high-quality data connections under industry standard service agreements. iBasis is a GSMA-qualified GRX provider and engineered its GRX service in full compliance with GSM Association standards and recommendations.

For more details on iBasis GRX Service, and the companys Mobile Matrix portfolio of data services for MNOs, visit http://ibasis.com/mobile-operators/data-roaming.aspx.

About iBasis
Founded in 1996, iBasis (NASDAQ: IBAS) is a leading wholesale carrier of international long distance telephone calls and a provider of retail prepaid calling services and enhanced services for mobile operators. iBasis customers include KPN, KPN Mobile, E-Plus, BASE, TDC and many other large telecommunications carriers such as Verizon, Vodafone, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica. In October 2007, iBasis acquired KPN Global Carrier Services to create one of the three largest carriers of international voice traffic in the world (1), and KPN became a majority stockholder of iBasis. The company carried approximately 24 billion minutes of international voice traffic in 2008. The Company can be reached at its worldwide headquarters in Burlington, Mass., USA at +1 781-505-7500 or on the Internet at www.ibasis.com.

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1. Based on Telegeography 2009 and iBasis and KPN Global Carrier Services 2008 traffic.

iBasis and KPN are registered marks, and Mobile Matrix is a trademark of iBasis. All other trademarks are the property of their respective owners.

Except for historical information, all of the expectations, plans and assumptions contained in the foregoing press release constitute forward-looking statements under Section 21E of the Securities Exchange Act of 1934 and involve risks and uncertainties that could cause results to vary materially. For a description of certain of these risks and uncertainties please read the Company’s most recent Annual Report on Form 10-K and other periodic and current reports, all of which are available atwww.sec.gov. Such forward-looking statements are only as of the date they are made.