Amdocs Supplies End-to-End GSM Customer Care and Billing Solution to VoiceStream Wireless.

BELLEVUE, Wash.--(BUSINESS WIRE)--November 23, 1999--

VoiceStream Wireless Corp. (NASDAQ: VSTR), a major GSM provider in the US, and Amdocs (NYSE: DOX), a major international provider of customer care, billing and order management solutions to the telecommunications industry, have announced an agreement to implement Amdocs' Ensemble end-to-end customer care and billing system.

VoiceStream, offering service in 25 states, will use Ensemble to support all of its subscribers. In addition to the tailored Ensemble software, Amdocs is providing VoiceStream with implementation, training, and ongoing support services, and will also be responsible for data center operations.

"We chose Amdocs' solution for its GSM support and track record in customer care and billing, which is the best in its class," said Robert Stapleton, President and COO. "The Amdocs system provides the flexibility and scalability we need to support our high volumes and quickly growing business. It also enables us to swiftly consolidate the billing operations of the GSM providers we are merging with."

Ensemble supports all unique aspects of the GSM environment, such as international roaming, acquisition and formatting of GSM data input formats, provisioning of GSM network elements, and inventory management of SIM cards and MSISDNs. With the implementation of VoiceStream, Amdocs' customer base will cover over 70% of GSM subscribers in the United States.

"Our total solutions approach offers the depth of services VoiceStream seeks as it consolidates its merged operations and expands into new territories and service offerings," said Norman Rafalowitz, Amdocs Senior Vice President, International Marketing. "We are confident that our strategic partnership with VoiceStream will meet their long-term business needs."

About VoiceStream Wireless

VoiceStream Wireless Corp. is a leading provider of wireless communications services in the western United States including Denver, Phoenix, Seattle, Salt Lake City, and Portland. VoiceStream has announced agreements to merge with Aerial Communications [NASDAQ: AERL] and Omnipoint Corporation [NASDAQ: OMPT]. When both transactions are completed, VoiceStream will own licenses to provide service to nearly 200 million people. VoiceStream Wireless currently provides personal communications service using the globally dominant GSM technology in 15 U.S. markets. Omnipoint provides PCS services in the eastern United States, including New York, Philadelphia, Boston, Miami, and Detroit. Aerial Communications, headquartered in Chicago, provides PCS service in Houston, Minneapolis, Kansas City, Pittsburgh, Tampa-St. Petersburg, Orlando, and Columbus, Ohio. For more information visit the Web site www.voicestream.com

About Amdocs

Amdocs is a leading provider of product-driven customer care, billing and order management solutions to premier telecommunications companies worldwide. Amdocs has an unparalleled success record in project delivery of its mission-critical products. Human resources of more than 4,600 information systems professionals are exclusively dedicated to the telecommunications industry. Amdocs has an installed base of more than 300 successful projects in more than 75 major telecommunications companies throughout the world. For more information visit our Web site at www.amdocs.com.

About Ensemble

Ensemble(TM) is Amdocs' platform for customer care, billing and order management solutions in voice and data environments. Ensemble supports convergent multi-service operations, including local, cellular, paging, long distance, international, broadband, Internet, and IP services. Ensemble includes advanced capabilities such as a flexible customer hierarchy facility and a multi-service rating engine. The system utilizes a scaleable, multi-tier, client-server UNIX platform and has been proven to support the high-volume performance requirements of leading carriers.