-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 DaRks4Xfuhx727j/fQ2yqg==

<SEC-DOCUMENT>0001140361-11-005537.txt : 20110202
<SEC-HEADER>0001140361-11-005537.hdr.sgml : 20110202
<ACCEPTANCE-DATETIME>20110202121624
ACCESSION NUMBER:		0001140361-11-005537
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110131
FILED AS OF DATE:		20110202
DATE AS OF CHANGE:		20110202

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRIMUS TELECOMMUNICATIONS GROUP INC
		CENTRAL INDEX KEY:			0001006837
		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE COMMUNICATIONS (NO RADIO TELEPHONE) [4813]
		IRS NUMBER:				541708481
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7901 JONES BRANCH DRIVE
		STREET 2:		SUITE 900
		CITY:			MCLEAN
		STATE:			VA
		ZIP:			22102
		BUSINESS PHONE:		7039022800

	MAIL ADDRESS:	
		STREET 1:		7901 JONES BRANCH DRIVE
		STREET 2:		SUITE 900
		CITY:			MCLEAN
		STATE:			VA
		ZIP:			22102

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MORGENS WATERFALL VINTIADIS & CO INC
		CENTRAL INDEX KEY:			0001016150
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-29092
		FILM NUMBER:		11565585

	BUSINESS ADDRESS:	
		STREET 1:		600 FIFTH AVENUE
		STREET 2:		27TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020
		BUSINESS PHONE:		2127050500

	MAIL ADDRESS:	
		STREET 1:		600 FIFTH AVENUE
		STREET 2:		27TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-01-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001006837</issuerCik>
        <issuerName>PRIMUS TELECOMMUNICATIONS GROUP INC</issuerName>
        <issuerTradingSymbol>PMUG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001016150</rptOwnerCik>
            <rptOwnerName>MORGENS WATERFALL VINTIADIS &amp; CO INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>600 FIFTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>27TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock $0.001 par value (&quot;Common Stock&quot;)</value>
            </securityTitle>
            <transactionDate>
                <value>2011-01-31</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2011-01-31</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>39000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.226</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>800000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The shares of Common Stock to which this note relates are held directly by Phaeton International (BVI) Ltd. (&quot;Phaeton&quot;), with respect to 331,300 shares and Phoenix Partners, L.P. (&quot;Phoenix&quot; and together with Phaeton, the &quot;Advisory Clients&quot;), with respect to 468,700 shares.</footnote>
        <footnote id="F2">Morgens, Waterfall, Vintiadis &amp; Company, Inc. (&quot;Morgens Waterfall&quot;) serves as the investment adviser to, and provides discretionary investment advisory services to, the Advisory Clients.  Edwin H. Morgens is the Chairman of Morgens Waterfall.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Morgens, Waterfall, Vintiadis &amp; Co., Inc., /s/ Edwin H. Morgens, Attorney-in-fact</signatureName>
        <signatureDate>2011-02-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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