    <SEC-DOCUMENT>0001564590-21-021329-index.html : 20210428
    <SEC-HEADER>0001564590-21-021329.hdr.sgml : 20210428
    <ACCEPTANCE-DATETIME>20210428160316
    ACCESSION NUMBER:		0001564590-21-021329
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20210428
    DATE AS OF CHANGE:		20210428

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			SMITH MICRO SOFTWARE, INC.
    		CENTRAL INDEX KEY:			0000948708
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
    		IRS NUMBER:				330029027
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-35525
    		FILM NUMBER:		21864165

    	BUSINESS ADDRESS:
    		STREET 1:		5800 CORPORATE DRIVE
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15237
    		BUSINESS PHONE:		4128375300

    	MAIL ADDRESS:
    		STREET 1:		5800 CORPORATE DRIVE
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15237

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	SMITH MICRO SOFTWARE, INC
    		DATE OF NAME CHANGE:	20181023

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	SMITH MICRO SOFTWARE INC
    		DATE OF NAME CHANGE:	19950731
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>smsi-defa14a_20210608.htm
    <DESCRIPTION>DEFA14A 2021 PROXY MATERIALS
    <TEXT>
    Document 1 - file: smsi-defa14a_20210608.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>gmdubgpet2wr000001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: gmdubgpet2wr000001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>gmdubgpet2wr000002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: gmdubgpet2wr000002.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>