Advanced Radio Telecom and Cable & Wireless Announce Multi-million Dollar Agreement.

Business/High Tech Editors

BELLEVUE, Wash. and VIENNA, Va.--(BUSINESS WIRE)--Feb. 20, 2001

Agreement Validates ART's Service Proposition for Major Carriers

Enables Cable & Wireless to Offer Broadband

Fixed Wireless Services in Select Metropolitan Areas

Advanced Radio Telecom Corp. (ART) (Nasdaq:ARTT), a leading provider of broadband fixed wireless Internet services, and Cable & Wireless (NYSE:CWP), the global telecommunications group, today announced they have entered into a 10-year agreement whereby ART will provide broadband fixed wireless services to Cable & Wireless in certain markets in the United States.

The agreement will generate approximately $11 million in total revenue for ART, all of which will be paid in the first year. Cable & Wireless expects to generate a comparable amount of revenue during the term of the agreement from providing broadband service to its customers and from providing value added IP services to ART.

"This agreement will enable Cable & Wireless to go directly to customer locations to provide high speed access through fixed broadband wireless infrastructure," said Todd Haven, vice president of Commercial Development, Cable & Wireless North America. "By going directly to the customer locations, we will be able to eliminate last mile bottlenecks and provision service in a matter of days."

"We chose ART because its solution provides reliability, rapid provisioning and the ability to grow with our customers' bandwidth needs," said Haven.

Under the terms of the agreement Cable & Wireless will utilize ART's broadband fixed wireless infrastructure to offer high speed Internet access in multiple markets.

"Cable & Wireless will assist ART in moving up the IP value chain by providing ART's sales channels with web hosting, dial and Internet access services delivered by one of the fastest backbone networks in the world," said Wharton "Zie" Rivers, CEO of ART. "Clearly, this relationship serves as an example of how carriers, large and small, are partnering to create an unbeatable value proposition to our customers."

About Cable & Wireless

Cable & Wireless is a major global telecommunications business with revenue of over (pound)9 billion (US$14 billion) in the year to 31 March 2000 and customers in 70 countries. Its operations around the world offer a full range of telecommunications services. Cable & Wireless' focus for future growth is on IP (Internet Protocol) and data services and solutions for business customers. It is developing advanced IP networks and value-added services in the US, Europe and the Asia-Pacific region in support of this strategy. With the capability of its global IP infrastructure and its strength in key markets, Cable & Wireless holds a unique position in terms of global coverage and services to business customers. For more information about Cable & Wireless, go to www.cw.com.

About ART

Advanced Radio Telecom Corp. (ART) provides broadband fixed wireless Internet services with speeds up to 155 Mbps. ART's BroadStream(TM) Internet Service's compelling price-performance package of 100 Mbps at $1,000 a month is designed for companies seeking fast Internet service and high bandwidth capacity. In addition to BroadStream Internet Service, ART provides dedicated, protected and redundant OC-3 service with speeds up to 155 Mbps to extend fiber capacity and provide redundancy for mission critical network connections to other service providers.

ART provides broadband services without the delay and disruption that can occur with phone company hook-up or fiber optic installation. ART can provision service in as fast as 10 working days and has a service level agreement that provides for 100% availability. ART is a Cisco Powered Network(TM) Service provider headquartered in Bellevue, Wash. For more information, visit ART's website at www.ipsp.com.

BroadStream IS Broadband

The above information includes forward-looking statements regarding operations, network deployment, network performance, revenues and services. These statements are not guarantees of future performance. Known and unknown risks, uncertainties, and other factors, including without limitation, capital requirements, need for additional financing and other financial risks, changes to the strategy and business plan, customer demand, technological risks, management of growth, satisfying borrowing conditions, competition and government regulation may cause actual results to differ materially from the future results implied or expressed in the forward looking statements. Additional information about the most significant of such factors is set forth in ART's most recent annual report on Form 10-K, most recent quarterly report on Form 10-Q and most recently filed registration statement on Form S-3. The Company does not undertake to update or revise its forward-looking statements publicly even if experience or future changes make clear that any projected results expressed or implied herein will not be realized.