EXHIBIT 17.3 STEPHEN M. LEAHY #11 -- 1155 MELVILLE STREET VANCOUVER, BC V6E 4C4 CANADA MARCH 8, 1998 BOARD OF DIRECTORS PORTACOM WIRELESS, INC. 10061 TALBERT AVE., SUITE #200 FOUNTAIN VALLEY, CA 92708 Dear Sirs: I hereby submit for your acceptance my resignation as a director and as Secretary of PortaCom Wireless, Inc., to become effective at 11:59 p.m. Pacific Standard Time on Sunday, March 8, 1998. Thank you. Sincerely, /s/ Stephen M. Leahy Stephen M. Leahy