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Press Release dated June 5, 2003

Call-Net Enterprises appoints CFO

en Français

(Toronto, ON)June 5, 2003  Call-Net Enterprises Inc., (TSX: FON, FON.B), a
national provider of residential and business telecommunications services,
today announced the appointment of Roy T. Graydon as executive vice president
and chief financial officer effective June 9, 2003.

Roy will play a key role in the continued drive toward improving enterprise
value, said Bill Linton, president and chief executive officer, Call-Net
Enterprises. He brings a depth of investment knowledge and experience, and
over the years, has helped a number of public companies develop growth
strategies and improve their financial and operating performance. Roy will be a
major contributor in the development of our own growth strategy.
 Mr. Graydon joins Call-Net from VGC Capital Partners where he was a managing
partner. Prior to that he was with the Ontario Teachers Pension Plan Board for
six years where he held the position of vice president, relationship investing
and responsible for managing a $1.5 billion portfolio of public companies in
Canada, the United States, and Europe. He also managed the worldwide corporate
governance and proxy voting activities of Ontario Teachers. Before that, he
held the position of portfolio manager, merchant banking where he was part of a
team managing a $2.5 billion portfolio of private and publicly held companies.

Prior to Ontario Teachers, Mr. Graydon spent seven years at TD Securities Inc.
He was a vice president and director, investment banking and was responsible
for mergers and acquisitions and corporate financing for a number of public and
privately held companies.

Mr. Graydon will report to Bill Linton, and be responsible for the finance,
strategic planning, investor relations, treasury, internal audit and corporate
development functions. He holds an MBA from the Richard Ivey School of Business
and a Bachelor of Science (Honours, Geophysics) from the University of Western
Ontario.

While at Ontario Teachers, he was elected to the board of Call-Net, serving as
a director from June 2000 to October 2001. He currently serves as the
vice-chair of the board of trustees at The Ontario Science Centre.

About Call-Net Enterprises

Call-Net Enterprises Inc. is a leading Canadian integrated communications
solutions provider of local and long distance voice services as well as data,
networking solutions and online services. The Company provides services to
residential consumers and businesses primarily through its wholly owned
subsidiary, Sprint Canada Inc. Call-Net Enterprises is headquartered in
Toronto, owns and operates an extensive national fibre network and has over 134
co-locations in nine Canadian metropolitan markets. For more information, visit
the Companys web sites at www.callnet.ca and www.sprint.ca.

Note for Investors:

This news release may include statements about expected future events and/or
financial results that are forward-looking in nature and subject to risks and
uncertainties. For those statements, we claim the protection of the safe
harbour for forward-looking statements provisions contained in the Private
Securities Litigation Reform Act of 1995. The company cautions that actual
performance will be affected by a number of factors, many of which are beyond
its control. Future events and results may vary substantially from what the
company currently foresees. Discussion of the various factors that may affect
future results is contained in the companys recent filings with the Securities
and Exchange Commission, the Ontario Securities Commission and SEDAR.

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|For further information                                                                        |  |                                                                                                          
|Media contact:
Karen OLeary
Corporate Communications
(416) 718-6445
koleary.sprint-canada.com |  | Investor Relations contact:
Farzana Giga
Investor Relations
(416) 718-6251
farzana.giga@sprint-canada.com