EXHIBIT 32.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned hereby certifies, in accordance with 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Smith Micro Software, Inc., that, to his knowledge, the Annual Report of Smith Micro Software, Inc. on Form — K/A (Amendment No. 1) for the period ended December 31, 2004, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the company.

April 29, 2005	By:	/s/ William W. Smith, Jr.
	William W. Smith, Jr.
	Chairman of the Board, President and Chief Executive Officer (Principal Executive Officer)

April 29, 2005	By:	/s/ Robert W. Scheussler
	Robert W. Scheussler
	Chief Operating Officer and Chief Financial Officer (Principal Financial Officer)