Call-Net Enterprises to release Q1 results on Tuesday, May 3, 2005 TORONTO, April 21 /PRNewswire-FirstCall/ -- Call-Net Enterprises Inc. (TSX: FON, FON.NV.B) will release its first quarter results on Tuesday, May 3, 2005 at 12:00 noon. Later the same day, the Company will hold a quarterly teleconference call. Date: Tuesday, May 3, 2005 Time: 2:00 p.m. ET Participants: Bill Linton, president and chief executive officer Roy Graydon, executive vice president & chief financial officer Access Number: 1-877-888-3490 Confirmation: T563595S Webcast: http://www.callnet.ca/ or http://www.newswire.ca/en/webcast/viewEvent.cgi?eventID(equal sign)935880 To participate in the conference call, please call the access number 10 minutes prior to the scheduled start time and request Call-Net's first quarter results teleconference. If you require assistance during the conference call, you can reach an operator by pressing '0'. A replay of the conference call will be available as follows: Replay: 1-888-509-0081 until May 11, 2005. Archive: The audio webcast will be archived at http://www.callnet.ca/ About Call-Net Enterprises Inc. Call-Net Enterprises Inc., primarily through its wholly owned subsidiary Sprint Canada Inc., is a leading Canadian integrated communications solutions provider of home, long distance, dial-up Internet and wireless phone services to consumers and local, long distance, toll free, enhanced voice, data and IP services to businesses of all sizes across Canada. Call-Net, headquartered in Toronto, owns and operates an extensive national fibre network, has over 148 co-locations in five major urban areas including 31 municipalities and maintains network facilities in the United States and the United Kingdom. For more information, visit the Company's web sites at http://www.callnet.ca/ and http://www.sprint.ca/. DATASOURCE: Call-Net Enterprises Inc. CONTACT: Karen O'Leary, (416) 718-6445,

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