SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                 SCHEDULE 13D/A

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 6)

                    CELLULAR TECHNICAL SERVICES COMPANY, INC.
                                (Name of Issuer)


                          COMMON STOCK, $.001 par value
                         (Title of Class of Securities)


                                    151167103
                                 (CUSIP Number)


                                Terren S. Peizer
                        Beachwood Financial Company, Inc.
                723 Pacific Coast Highway, Santa Monica, CA 90402
                            Telephone: (310) 394-1189
       (Name, Address and Telephone Number of Person Authorized to Receive
                           Notices and Communications)


                                  July 1, 1997
             (Date of Event Which Requires Filing of this Statement)



If the filing person has previously  filed a statement on Schedule 13G to report
the acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of Sections 240.13d-1(e),  240.13d-1(f) or 240.13d-1(g),  check
the following box. /_/






                                                          Page 2 of 6 Pages
CUSIP No. 151167103

(1)      Names of Reporting Persons
         I.R.S. Identification Nos. of Above Persons (entities only)

         Terren S. Peizer
         723 Pacific Coast Highway
         Santa Monica, CA  90402

(2)      Check the Appropriate Row if a Member of a Group (See Instructions)

         (a)   Not Applicable

         (b)   Not applicable

(3)      SEC Use Only


(4)      Source of Funds (See Instructions)

         Not Applicable

(5)      Check if Disclosure of Legal  Proceedings is Required Pursuant to Items
         2(d) or 2(e)

         Not applicable

(6)      Citizenship or Place of Organization

         USA


        Number of          (7)      Sole Voting Power:          310,000 Shares
          Shares
       Beneficially        (8)      Shared Voting Power:        - 0 -
      Owned by Each
        Reporting          (9)      Sole Dispositive Power:     310,000 Shares
       Person With
                           (10)     Shared Dispositive Power:   - 0 -



(11)     Aggregate Amount Beneficially Owned by Each Reporting Person

           310,000 Shares

(12)     Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
         Instructions)

         Not applicable

(13)     Percent of Class Represented by Amount in Row (11)

         Less than 5%

(14)     Type of Reporting Person (See Instructions)

         IN







                                                            Page 3 of 6 Pages
CUSIP No. 151167103

ITEM 1 - SECURITY AND ISSUER

         This report relates to the Common Stock,  $.001 par value,  of Cellular
Technical Services Company,  Inc., a Delaware corporation (the "Issuer"),  whose
principal  executive  offices  are located at 2401 Fourth  Avenue,  Seattle,  WA
98121.


ITEM 2 - IDENTITY AND BACKGROUND

         (a)      The person filing this statement is Terren S. Peizer.

         (b)      The  principal  business  address of Mr. Peizer is 723 Pacific
                  Coast Highway, Santa Monica, CA 90402.

         (c)      Mr. Peizer's  principal  occupation is as a private  investor,
                  which  occupation  he carries  on in his own name and  through
                  Beachwood Financial Company, Inc., a California corporation.

         (d)      Mr. Peizer has not, during the last five years, been convicted
                  in a criminal  proceeding  (excluding  traffic  violations  or
                  similar misdemeanors).

         (e)      Mr. Peizer was not,  during the last five years,  a party to a
                  civil  proceeding  of a  judicial  or  administrative  body of
                  competent  jurisdiction as a result of which he was subject to
                  a judgment,  decree or final order enjoining future violations
                  of, or prohibiting or mandating activities subject to, federal
                  or state securities laws.

         (f) Mr. Peizer is a citizen of the United States.


ITEM 3 - SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         Not Applicable.


ITEM 4 - PURPOSE OF TRANSACTION

         Mr.  Peizer has  acquired  the shares  reported  herein for purposes of
investment.  Depending upon market  conditions and other factors that Mr. Peizer
deems material to his investment  decision,  Mr. Peizer may purchase  additional
shares of Common Stock or other securities of the Issuer in the open market,  in
private  transactions or from the Issuer,  or may dispose of all or a portion of
the shares of Common Stock or other securities of the Issuer that he now owns or
hereafter may acquire. Other than as set forth above, Mr. Peizer has no plans or
proposals which relate to or would result in:

         (a)      The acquisition by any person of additional securities of the
                  Issuer, or the disposition of securities of the Issuer;

         (b)      An  extraordinary  corporate  transaction,  such as a  merger,
                  reorganization or liquidation,  involving the Issuer or any of
                  its subsidiaries;

         (c)      A sale or transfer of a material amount of assets of the
                  Issuer or any of its subsidiaries;





                                                            Page 4 of 6 Pages
CUSIP No. 151167103

         (d)      Any change in the present  board of directors or management of
                  the Issuer,  including  any plans or  proposals  to change the
                  number or term of directors or to fill any existing  vacancies
                  on the board;

         (e)      Any material change in the present capitalization or dividend
                  policy of the Issuer;

         (f)      Any other material change in the Issuer's business or
                  corporate structure;

         (g)      Changes  in  the  Issuer's  charter,   bylaws  or  instruments
                  corresponding  thereto or other  actions  which may impede the
                  acquisition of control of the Issuer by any person;

         (h)      Causing a class of  securities  of the  Issuer to be  delisted
                  from  a  national  securities  exchange  or  to  cease  to  be
                  authorized to be quoted in an inter-dealer quotation system of
                  a registered national securities association;

         (i)      A class of equity  securities of the Issuer becoming  eligible
                  for termination of registration  pursuant to Section  12(g)(4)
                  of the Act; or

         (j) Any action similar to any of those enumerated above.


ITEM 5 - INTEREST IN SECURITIES OF THE ISSUER

         (a)      Mr. Peizer is the  beneficial  owner of 310,000  shares of the
                  Common Stock of the Issuer,  constituting less than 5% of such
                  class.

         (b)      Mr  Peizer  has the sole  power to vote,  direct  the vote of,
                  dispose of, and direct the disposition of the shares described
                  in (a), above.

         (c)      Mr. Peizer has not engaged in any transactions in the Issuer's
                  Common Stock within the past 60 days.

         (d)      Not applicable.

         (e)      Mr. Peizer  ceased to be a beneficial  owner of more than five
                  percent of the class of securities on July 1, 1997.


ITEM 6 - CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE ISSUER

         There are no contracts,  arrangements,  understandings or relationships
between Mr.  Peizer and any other person with respect to any  securities  of the
Issuer.


ITEM 7 - MATERIAL TO BE FILED AS EXHIBITS

         No exhibits are filed herewith.







                                                             Page 5 of 6 Pages
CUSIP No. 151167103


                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Date:  March 25, 1998


                                              /s/ Terren S. Peizer
                                                  TERREN S. PEIZER