-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 AgEJKGJCgwQ2wPwC2jnEQMTaGb7d4FnF5NbbFz4UyPZnOE4QUwZBRPQPJBrajmlw
 /1YnN68IhR0w0ciJh8ynxw==

<SEC-DOCUMENT>0001209191-10-027356.txt : 20100512
<SEC-HEADER>0001209191-10-027356.hdr.sgml : 20100512
<ACCEPTANCE-DATETIME>20100512182114
ACCESSION NUMBER:		0001209191-10-027356
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100511
FILED AS OF DATE:		20100512
DATE AS OF CHANGE:		20100512

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			De Cardenas Alfredo T.
		CENTRAL INDEX KEY:			0001430032

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32432
		FILM NUMBER:		10825705

	MAIL ADDRESS:	
		STREET 1:		SYNIVERSE HOLDINGS, INC.
		STREET 2:		8125 HIGHWOODS PALM WAY
		CITY:			TAMPA
		STATE:			FL
		ZIP:			33647

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SYNIVERSE HOLDINGS INC
		CENTRAL INDEX KEY:			0001169264
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATION SERVICES, NEC [4899]
		IRS NUMBER:				300041666
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		8125 HIGHWOODS PALM WAY
		CITY:			TAMPA
		STATE:			FL
		ZIP:			33647
		BUSINESS PHONE:		8136375000

	MAIL ADDRESS:	
		STREET 1:		8125 HIGHWOODS PALM WAY
		CITY:			TAMPA
		STATE:			FL
		ZIP:			33647

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TSI TELECOMMUNICATION HOLDINGS INC
		DATE OF NAME CHANGE:	20020315
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c00910_4x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-05-11</periodOfReport>

    <issuer>
        <issuerCik>0001169264</issuerCik>
        <issuerName>SYNIVERSE HOLDINGS INC</issuerName>
        <issuerTradingSymbol>SVR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001430032</rptOwnerCik>
            <rptOwnerName>De Cardenas Alfredo T.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SYNIVERSE HOLDINGS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>8125 HIGHWOODS PALM WAY</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33647</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP - Americas</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-05-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11768</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.19</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>42040</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <ownerSignature>
        <signatureName>/s/ Laura E. Binion, under a power of attorney</signatureName>
        <signatureDate>2010-05-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----