<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-12-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001022652</issuerCik>
        <issuerName>INSEEGO CORP.</issuerName>
        <issuerTradingSymbol>INSG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001747770</rptOwnerCik>
            <rptOwnerName>Golden Harbor Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CAY HOUSE, EP TAYLOR DRIVE N7776</rptOwnerStreet1>
            <rptOwnerStreet2>LYFORD CAY</rptOwnerStreet2>
            <rptOwnerCity>NEW PROVIDENCE</rptOwnerCity>
            <rptOwnerState>C5</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>BAHAMAS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001015747</rptOwnerCik>
            <rptOwnerName>LEWIS JOSEPH</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CAY HOUSE, EP TAYLOR DRIVE N7776</rptOwnerStreet1>
            <rptOwnerStreet2>LYFORD CAY</rptOwnerStreet2>
            <rptOwnerCity>NEW PROVIDENCE</rptOwnerCity>
            <rptOwnerState>C5</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>BAHAMAS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-12-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9752729</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18799229</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to a Stock Purchase Agreement dated December 4, 2018, as amended, between Golden Harbor Ltd. (&quot;Golden Harbor&quot;) and  Continental General Insurance Company (&quot;Continental&quot;), Golden Harbor purchased, and Continental sold, 9,752,729 shares of Common Stock.</footnote>
        <footnote id="F2">These securities are owned directly by Golden Harbor, which may be deemed to be a member of a &quot;group&quot; for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, consisting of Golden Harbor and Joseph C. Lewis. Mr. Lewis is the sole indirect beneficial owner of and controls Golden Harbor.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Golden Harbor Ltd., By: /s/ Jason C. Callender, Jason C. Callender, Director &amp; Vice President</signatureName>
        <signatureDate>2018-12-19</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Joseph C. Lewis, /s/ Joseph C. Lewis, Joseph C. Lewis</signatureName>
        <signatureDate>2018-12-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
