Exhibit 32.1

CERTIFICATIONS 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 Quarterly Report on Form 10-Q for the period ended March 31, 2021 of Smith Micro Software, Inc. (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of Smith Micro Software, Inc.

May 12, 2021	By	/s/ William W. Smith, Jr.
	William W. Smith, Jr.
	Chairman of the Board, President and Chief Executive Officer
	(Principal Executive Officer)
May 12, 2021	By	/s/ Timothy C. Huffmyer
	Timothy C. Huffmyer
	Vice President and Chief Financial Officer
	(Principal Financial and Accounting Officer)

A signed original of this written statement required by Section 906 has been provided to Smith Micro Software, Inc. and will be retained by Smith Micro Software, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.