<SUBMISSION>
<ACCESSION-NUMBER>0001209191-09-053797
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20091119
<FILING-DATE>20091120
<DATE-OF-FILING-DATE-CHANGE>20091120
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Campbell John Howard
<CIK>0001472724
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-33963
<FILM-NUMBER>091198929
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O IRIDIUM COMMUNICATIONS INC.
<STREET2>6707 DEMOCRACY BOULEVARD, SUITE 300
<CITY>BETHESDA
<STATE>MD
<ZIP>20817
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Iridium Communications Inc.
<CIK>0001418819
<ASSIGNED-SIC>3669
<IRS-NUMBER>221344998
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>6707 DEMOCRACY BOULEVARD
<STREET2>SUITE 300
<CITY>BETHESDA
<STATE>MD
<ZIP>20817
<PHONE>301-571-6200
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>6707 DEMOCRACY BOULEVARD
<STREET2>SUITE 300
<CITY>BETHESDA
<STATE>MD
<ZIP>20817
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>GHL Acquisition Corp.
<DATE-CHANGED>20071119
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-11-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001418819</issuerCik>
        <issuerName>Iridium Communications Inc.</issuerName>
        <issuerTradingSymbol>IRDM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001472724</rptOwnerCik>
            <rptOwnerName>Campbell John Howard</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O IRIDIUM COMMUNICATIONS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>6707 DEMOCRACY BOULEVARD, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>BETHESDA</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20817</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Iridium Satellite LLC</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.73</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2009-11-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>135000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-11-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>135000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>135000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">33,750 shares of common stock underlying the option vest on November 19, 2010 and with regard to the balance of 101,250 shares of common stock underlying the option, vesting commences on November 19, 2010 in twelve equal quarterly installments.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Christi Novak, attorney-in-fact</signatureName>
        <signatureDate>2009-11-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
