Press Release

U.S. Cellular Uses Narus� IP Platform as Competitive Edge

Announces Deployment of Narus’ IP Platform for IP Data Billing Mediation

Mountain View, Calif., March 14, 2005—U.S. Cellular Corporation (AMEX: USM) has deployed Narus’ Carrier-Class IP Platform software to provide IP billing mediation for its easyedge^SM data application services.

Narus’ IP Platform is operational in the U.S. Cellular network, providing volume and content-based billing mediation for the company’s messaging and easyedge^SM services. U.S. Cellular is using the solution for all data billing mediation across their customer base of more than 4.9 million subscribers in 148 markets in 25 states.

“The flexibility and ease with which we can expand and add applications differentiates Narus from any point-solution competitors,” said Mike Irizarry, executive vice president and CTO at U.S. Cellular. “The Narus IP Platform gives us a competitive advantage, allowing us to efficiently add applications that in turn allow us to provide more value to our customers.”

The Narus IP Platform provides a “total network view” of IP data from Layer 2 to Layer 7, across multiple networks. The Platform captures, analyzes and correlates traffic across the multiple networks, providing a normalized interface to multiple applications.

“With Narus we can launch new applications based on the same installed platform and normalized data,” said Irizarry. “That the Narus IP Platform is application and network agnostic was critical in our vendor selection.”

“We are pleased to be helping a market-leader like U.S. Cellular achieve its objectives with the use of our advanced visualization and billing mediation applications,” said Greg Oslan, President and CEO, Narus. “The Narus IP Platform delivers on those requirements and assures U.S. Cellular a scalable solution to meet their future business needs."

About Narus, Inc.

Narus is the leader in real-time traffic intelligence for large IP networks, and is the only company that provides security, intercept and traffic management solutions within a single, flexible system. With Narus, service providers, governments and large enterprises around the world can immediately detect, analyze, mitigate and target any unwanted, unwarranted or malicious traffic. Narus provides its customers with complete, real-time insight into all of their IP traffic from the network to the applications. Combined with the ability to enable numerous actions, Narus customers have the ability to take the most appropriate actions quickly.

Narus’ system protects and manages the largest IP networks around the world including AT&T, KT (Korea), KDDI (Japan), Telecom Egypt, Reliance (India), Saudi Telecom, US Cellular and Pakistan Telecom Authority. Narus is headquartered in Mountain View, California with regional offices around the world. For more information, please visit www.narus.com.

Media Contact

Kathleen Shanahan
Boca Communications
T: 415.570.1405