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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 QbWdYsCR9BMAj7djwYXW8CqLk2SSH2b/xox0nsdZdWY0dtc7/uZ9bkmxeQ6i8HdS
 69CbTLu5O69RyjkZxpWzsA==

<SEC-DOCUMENT>0001179110-05-015917.txt : 20050809
<SEC-HEADER>0001179110-05-015917.hdr.sgml : 20050809
<ACCEPTANCE-DATETIME>20050809160245
ACCESSION NUMBER:		0001179110-05-015917
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050809
FILED AS OF DATE:		20050809
DATE AS OF CHANGE:		20050809

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lahman Scott
		CENTRAL INDEX KEY:			0001304493

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50928
		FILM NUMBER:		051009911

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		310-636-3100

	MAIL ADDRESS:	
		STREET 1:		3415 SOUTH SEPULVEDA, SUITE 700
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90034

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			JAMDAT MOBILE INC
		CENTRAL INDEX KEY:			0001135271
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				954991817

	BUSINESS ADDRESS:	
		STREET 1:		3415 S. SEPULVEDA BLVD.
		STREET 2:		SUITE 700
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90034
		BUSINESS PHONE:		310-636-3100

	MAIL ADDRESS:	
		STREET 1:		3415 S. SEPULVEDA BLVD.
		STREET 2:		SUITE 700
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90034
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-08-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001135271</issuerCik>
        <issuerName>JAMDAT MOBILE INC</issuerName>
        <issuerTradingSymbol>JMDT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001304493</rptOwnerCik>
            <rptOwnerName>Lahman Scott</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>JAMDAT MOBILE INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3415 S. SEPULVEDA BLVD., SUITE 700</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90034</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, Publishing</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-08-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>27.5102</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>199710</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Note</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 27, 2004.</footnote>
        <footnote id="F2">Represents 199,710 shares of common stock held by The Lahman Family Trust dated September 8, 2004.  Scott Lahman, along with his wife, is co-trustee of the Lahman Family Trust dated 09/08/04, has voting and dispositive power over the shares of common stock held by the trust.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Craig Gatarz, by power of attorney</signatureName>
        <signatureDate>2005-08-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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