Advanced Radio Telecom Launches Broadband Wireless IP Network in Phoenix.

Business Editors, High-Tech Writers

BELLEVUE, Wash.--(BUSINESS WIRE)--June 30, 2000

Advanced Radio Telecom Corp. (ART) (Nasdaq:ARTT) today launched its metropolitan broadband, Internet Protocol (IP) network in Phoenix. Phoenix is the fourth U.S. market ART has launched this week, the fifth during the month of June, and sixth overall. In addition to Phoenix, ART now offers its broadband IP services in Los Angeles, Washington, D.C., Houston, Seattle and San Jose.

ART has said it plans to deploy its service in 10 U.S. markets during the year 2000.

"Yesterday, ART met its second quarter deployment objective with our network launch in Los Angeles. Today, we exceeded our objective with the Phoenix launch," said Robert S. McCambridge, ART's COO and president. "As we move forward, we have two main objectives for the remainder of the year: turning on additional U.S. metropolitan markets; and acquiring additional customers to drive revenue in the markets where we're up and running."

Through its integrated service, ART is able to provide businesses with IP Ethernet connectivity to the wide area network at 10 Mbps and 100 Mbps speeds. Additionally, ART provides OC-3 connectivity at 155 Mbps for data center and other high capacity bandwidth applications.

ART's broadband wireless IP network uniquely provides connectivity to office buildings not served by fiber connections. ART enables Internet Service Providers (ISPs), Application Service Providers (ASPs) and interexchange carriers (IXCs) to extend customer LANs to Wide Area Networks at native LAN speeds. ART's services eliminate the need for local telephone hook-up and service can be provisioned in a matter of days, instead of weeks or even months.

About Advanced Radio Telecom

Advanced Radio Telecom Corp., headquartered in Bellevue, Wash., is a provider of broadband wireless Internet Protocol (IP) access services at speeds up to 155 Mbps. ART currently owns and operates 100 Mbps broadband wireless metropolitan area networks in Houston, Los Angeles, Phoenix, Seattle, San Jose and Washington, D.C. and plans to expand to 40 markets over the next three years. ART is a Cisco Powered Network(TM) service provider. ART has a nationwide footprint of 39GHz spectrum licenses in the United States, and owns 26GHz and/or 39GHz spectrum licenses in the United Kingdom and several Scandinavian countries. For more information, please visit ART's web site at www.ipsp.com.

The above information includes forward-looking statements regarding services and network deployment. These statements are not guarantees of future performance. Known and unknown risks, uncertainties, and other factors, including without limitation, satisfying closing conditions, final FCC approval, capital requirements and other financial risks, customer demand, technological risks, management of growth, 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. 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.