Carrier1 Adds London and Geneva to Its Metro Networks.

Business Editors

ZURICH, Switzerland--(BUSINESS WIRE)--May 14, 2001

Carrier1 (Neuer Markt: CJN; NASDAQ: CONE), a leading European provider of end-to-end Internet, voice, bandwidth, data centre and access solutions to large users of communication services, today announced the development of Metropolitan networks in London and Geneva.

The London metro build will extend 110 km and is expected to be completed in 2001. It will connect major business and telecom locations with high capacity, multi-duct infrastructure. The Geneva metro build will extend 25 km and is scheduled to be ready for service in the third quarter of 2001.

By the end of 2001, Carrier1 will have metropolitan networks in 10 locations, including Amsterdam, Berlin, Dusseldorf, Geneva, Hamburg, Hanover, London, Milan, Munich and Paris. The Amsterdam network is completed while the Paris network is being extended to reach further large communication-centric locations. Three additional metropolitan networks are expected to be completed in 2002, including Frankfurt, Rotterdam and the Hague.

"The need for high-capacity metropolitan optical infrastructure is growing rapidly in Europe and Carrier1 will benefit from a definite competitive edge to deliver bandwidth, Internet and optical services for years to come", said Neil Craven, EVP Bandwidth and Infrastructure services.

About Carrier1

Carrier1 International S.A. is one of Europe's top providers of large system solutions for end-to-end Internet, broadband, voice, data-centre and dialup access communications to large users of telecommunications services with a network that spans 14,000 contracted route kilometres in 13 countries, and links 35 European cities. Carrier1 provides its clients with carrier-grade transport and network solutions as well as end-user-ready, value-added services that customers then brand and market to their respective users.

For media and investor information, please contact: Nicole Blanchard

Helene Baril Carrier1 Carrier1 Vice President, Corporate Communications Director, Investor Relations and Investor Relations [e-mail] [e-mail] Tel: [phone] Tel: [phone]

U.S. media please contact:

George Sopko or Michael Kassin at Stanton Crenshaw Communications,

Tel: [phone] ([e-mail] or

[e-mail])

Forward Looking Statement:

The information contained in this press release contains "forward-looking" statements within the meaning of the U.S. federal securities laws. These statements can be identified by the use of forward-looking terminology such as "believes", "expects", "plans", "estimates", "may", "will", "should" or "anticipates" or the negative thereof or other variations thereon or comparable terminology, or by discussions of strategy that involve risks, uncertainties and assumptions.

These statements include those regarding (i) the buid-out of the Company's metro networks and the timing thereof and (ii) the growth of the demand for high-capacity metropolitan optical infrastructure and (iii) the impact of the build-out on the Company's competitive position.

These statements are based on the current expectations of the management of Carrier1 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, judicial or competitive developments; decline in Carrier'1 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, failure to obtain any necessary financing if management's business plan assumptions are not met, performance failure by third parties with whom Carrier1 has contracted including for the supply or maintenance of infrastructure components and by joint venture partners; the risk of termination of certain joint ventures through which Carrier1 operates; the amount of indebtedness incurred by Carrier1 and its obligations thereunder.

For a more detailed discussion of these risks, uncertainties and other factors affecting the Company, please refer to the Company's prospectus and periodic reports filed with the U.S. Securities and Exchange Commission on Form 10-K, 10-Q and 8-K, including its 10-K for the year ended 31 December 2000. Corresponding filings are available at the Frankfurt Stock Exchange.