Carrier1 Announces Agreement with AOL to Provide Network Services in the United Kingdom.

Business Editors & Internet/On-Line Writers

ZURICH, Switzerland--(BUSINESS WIRE)--Sept. 25, 2000

Carrier1 International S.A. (Neuer Markt: CJN; NASDAQ:CONE) today announced an agreement with America Online, Inc., the world's leading interactive services company, to provide dialup access services for AOL in the United Kingdom as part of AOL's portfolio of network providers.

Alex Schmid, Carrier1's Executive Vice President for Strategic Development, said, "We believe that it is a tremendous validation of our strategy, quality of service and execution track record to have been selected by AOL as one of the company's portfolio of dialup access providers. We are delighted to enter into this relationship with the world's leading provider of interactive services."

Carrier1 International S.A. is a pan-European facilities- based provider of end-to-end Internet, voice, bandwidth, data center, and access solutions. Carrier1 provides its clients with carrier-grade transport and network solutions as well as end-user-ready value added services. Carrier1 customers brand and market these solutions and services to their respective end-users.

The Carrier1 pan-European inter-city fibre network connects 12 countries and currently spans over approximately 11,000 route kilometres connecting our points-of-presence in more than 20 European cities. Carrier1 is operational in all 12 countries and has secured all the necessary interconnects and operational licenses that allow it to provide network solutions and end-user ready value-added services. Carrier1 is also constructing 6 city ring fibre networks and plans to build/acquire at least another 14 city ring fibre networks. Through its investment in the joint venture Digiplex, Carrier1 is building 8 full-service data center facilities and plans to build at least another 12 data center facilities.

Carrier1's principal management services subsidiary is located in Zurich, Switzerland. Carrier1 is listed on the Neuer Market in Frankfurt under the ticker symbol "CJN", and on the NASDAQ in New York under the ticker symbol "CONE".

Forward Looking Statements: The information contained in this press release contains "forward-looking statements" within the meaning of the U.S. Federal Securities Law. These statements relate to our future growth in: demand for our services and our network (including our city rings, date centers and other infrastructure) development, connection costs and quality of services. These statements are based on the current expectations of the management of Carrier 1 International S.A., and performance is subject to risks, uncertainties and other factors that could cause actual results to differ materially from these statements. Such risks include, but are not limited to, adverse regulatory, technological or competitive developments, decline in demand for the company's services or products, inability to timely develop and introduce new technologies, products and services, pressure on pricing resulting from competition, unforeseen construction delays, and failure to receive on a timely basis necessary permits or other governmental approvals, and failure to obtain any necessary financing which could cause the actual results or performance of the company to differ materially from those described herein. For a more detailed discussion of such risks and uncertainties affecting the company other factors please refer to the company's prospectuses and 10-K,10-Q and 8-K reports filed with the U.S. Securities and Exchange Commission, including its 10-K for the year ended 31 December 1999 and its 10-Q for the 3-month period ended 31 March 2000 and the 3-month period ended 30 June 2000.