-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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,
 IH6rEXGoeR4KQqDtjb33weBRCFCBmK+OsEae3TJe0lYKox/Bsnw8OjFOX2kntBHQ
 MwCWVB5WzY0gzXHxI+sGeg==

<SEC-DOCUMENT>0000910680-04-001111.txt : 20041025
<SEC-HEADER>0000910680-04-001111.hdr.sgml : 20041025
<ACCEPTANCE-DATETIME>20041025141009
ACCESSION NUMBER:		0000910680-04-001111
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041022
FILED AS OF DATE:		20041025
DATE AS OF CHANGE:		20041025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Block Kenneth
		CENTRAL INDEX KEY:			0001303897

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19437
		FILM NUMBER:		041093668

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		516-568-0100

	MAIL ADDRESS:	
		STREET 1:		20 EAST SUNRISE HIGHWAY
		CITY:			VALLEY STREAM
		STATE:			NY
		ZIP:			11581

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CELLULAR TECHNICAL SERVICES CO INC
		CENTRAL INDEX KEY:			0000876378
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				112962080
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2815 SECOND AVENUE
		STREET 2:		SUITE 100
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98121
		BUSINESS PHONE:		2064436400

	MAIL ADDRESS:	
		STREET 1:		2815 SECOND AVENUE
		STREET 2:		SUITE 100
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98121
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>f3block102204_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-10-22</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000876378</issuerCik>
        <issuerName>CELLULAR TECHNICAL SERVICES CO INC</issuerName>
        <issuerTradingSymbol>CTSC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001303897</rptOwnerCik>
            <rptOwnerName>Block Kenneth</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>20 EAST SUNRISE HIGHWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>VALLEY STREAM</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>11581</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer &amp; Secy</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Kenneth Block</signatureName>
        <signatureDate>2004-10-25</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----