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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2022-06-27</periodOfReport>

    <dateOfOriginalSubmission>2022-06-27</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001581760</issuerCik>
        <issuerName>Life360, Inc.</issuerName>
        <issuerTradingSymbol>360.AX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001932923</rptOwnerCik>
            <rptOwnerName>Rice David William</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LIFE360, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>539 BRYANT STREET, SUITE 402</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operating Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>392832</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 317,570 shares of the Issuer's common stock underlying 952,710 Chess Depositary Interests (&quot;CDIs&quot;). The CDIs are traded on the Australian Securities Exchange (the &quot;ASX&quot;) and are held by CHESS Depositary Nominees Pty, Limited, a subsidiary of ASX Limited, the company that operates the ASX. Also includes 62,300 restricted stock units, each of which represents a contingent right to receive one share of the Issuer's common stock upon vesting.</footnote>
        <footnote id="F2">As the result of an administrative error, the Form 3 filed by the Reporting Person on June 27, 2022 under-reported this amount by 358 shares. This Form 3/A is being filed to correct such number of shares reported in this column 2.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Daniel Menudier, as Attorney-in-Fact</signatureName>
        <signatureDate>2022-09-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
