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Exhibit 31.1

Section 302 Certification

I, William Linton, the President and Chief Executive Officer of Call-Net
Enterprises Inc., certify that:



|1. |  | I have reviewed this annual report on Form 40-F of Call-Net Enterprises
Inc.;                                                                                                                                                                                                                             
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|2. |  | Based on my knowledge, this report does not contain any untrue statement of
a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were
made, not misleading with respect to the period covered by this report;
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|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects
the financial condition, results of operations and cash flows of the issuer as
of, and for, the periods presented in this report;                       
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|4. |  | The issuers other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the issuer and have:                                                                                    



| | (a) |  | Designed such disclosure controls and procedures, or caused such disclosure
controls and procedures to be designed under our supervision, to ensure that
material information relating to the issuer, including its consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;
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| | (b) |  | Evaluated the effectiveness of the issuers disclosure controls and
procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of the end of the period covered
by this report based on such evaluation; and                                                                                           
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| | (c) |  | Disclosed in this report any change in the issuers internal control over
financial reporting that occurred during the period covered by the annual
report that has materially affected, or is reasonably likely to materially
affect, the issuers internal control over financial reporting; and                                                                        



|5. |  | The issuers other certifying officer(s) and I have disclosed, based on our
most recent evaluation of internal control over financial reporting, to the
issuers auditors and the audit committee of the issuers board of directors
(or persons performing the equivalent functions):
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| | (a) |  | All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the issuers ability to record, process, summarize
and report financial information; and
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| | (b) |  | Any fraud, whether or not material, that involves management or other
employees who have a significant role in the issuers internal control over
financial reporting.                                                                                               

Date: April 22, 2004



| | /s/ William Linton

Name:  William Linton
Title:    President & Chief Executive Officer
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