EXHIBIT 24.4

                                POWER OF ATTORNEY

        KNOW ALL PERSONS BY THESE PRESENTS: That the undersigned hereby
constitutes and appoints Stig Johansson, Joachim W. Bauer, Kees van Ophem, Neil
E. Craven, Eugene A. Rizzo and Terje Nordahl and each of them (with full power
to act alone) the undersigned's true and lawful attorney-in-fact and agent, with
full power of substitution and resubstitution, for and in the name and on behalf
of the undersigned, to execute any and all instruments and documents, and to do
any and all other acts and things, that any such attorney-in-fact and agent may
deem necessary or advisable, in compliance with the Securities Act of 1933, as
amended (the "Securities Act"), the Securities Exchange Act of 1934, as amended
and any rules, regulations and requirements of the Securities and Exchange
Commission (the "Commission") in respect thereof, in connection with the
registration under the Securities Act of shares of capital of Carrier 1
International S.A. (the "Shares") pursuant to a registration statement (the
"Registration Statement") to be filed with the Commission relating to the
offering from time to time to the public by beneficial holders of Dollar
Warrants and Euro Warrants of Carrier 1 International S.A. and by any other
person named in such Registration Statement of Shares (and any depositary
receipts in respect thereof); including specifically, but without limiting the
generality of the foregoing, the power and authority to execute, for and in the
name and on behalf of the undersigned in any and all capacities, the
Registration Statement, and any and all supplements and amendments (including,
without limitation, any pre-effective and post-effective amendments and any
subsequent registration statements pursuant to Rule 462(b) under the Securities
Act) to such Registration Statement, and any and all other instruments or
documents filed as a part of, or in connection with, such Registration Statement
and supplements and amendments thereto (including, without limitation, if
necessary, a registration statement under the Securities Act of depositary
shares represented by American depositary receipts to be filed on Form F-6); and
the undersigned hereby ratifies and confirms all that such attorneys-in-fact and
agents, or any of them, shall do or cause to be done by virtue hereof.

Signed this 2nd day of August, 2000.

                                            /s/ Mark A. Pelson
                                            ----------------------------------
                                            Name: Mark A. Pelson