CELLULAR TECHNICAL SERVICES CO INC
S-3, 1997-01-27
COMPUTER INTEGRATED SYSTEMS DESIGN
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    As filed with the Securities and Exchange Commission on January 27, 1997.

                                                      Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  ____________
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                  ------------
                    CELLULAR TECHNICAL SERVICES COMPANY, INC.
             (Exact name of registrant as specified in its charter)
                                  ------------
           Delaware                     4812                     11-2962080
(State or other jurisdiction      (Primary Standard           (I.R.S. Employer
    of incorporation           Industrial Classification     Identification No.)
    or organization)                  Code Number)
                              ---------------------


                  2401 Fourth Avenue, Seattle, Washington 98121
                                 (206) 443-6400
                        (Address, including zip code, and
                     telephone number, including area code,
                       of registrant's principal executive
                                    offices)

                              ---------------------


         Stephen Katz, Chairman of the Board and Chief Executive Officer
                    Cellular Technical Services Company, Inc.
                  2401 Fourth Avenue, Seattle, Washington 98121
                                 (206) 443-6400
       (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)

                              ---------------------

                           Copy of communications to:
                             Edward R. Mandell, Esq.
                       Parker Chapin Flattau & Klimpl, LLP
                           1211 Avenue of the Americas
                          New York, New York 10036-8701
                               Tel: (212) 704-6000
                               Fax: (212) 704-6288

                              ---------------------


      Approximate  date of proposed sale to the public:  From time to time after
the  effective  date of this  Registration  Statement  as  determined  by market
conditions.

      If any of the securities  being  registered on this form are to be offered
on a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act
of 1933, as amended (the "Securities Act"), check the following box. [X]

      If this Form is filed to register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [_]

      If this Form is a  post-effective  amendment filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [_]

      If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

                              ---------------------
<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
====================================================================================================
                                                  Proposed
                                                   Maximum      Proposed Maximum       Amount of
  Title of Each Class of         Amount to be    Offering Per  Aggregate Offering   Registration Fee
Securities to be Registered       Registered      Share (1)        Price (1)              (2)
- ----------------------------------------------------------------------------------------------------
<S>                            <C>                <C>             <C>                 <C>      
Shares of Common Stock,              
par value $.001 per share.......400,000 Shares    $17.0625        $6,825,000          $2,068.18

====================================================================================================
</TABLE>
(1)   Estimated solely for purposes of calculating the registration fee.
(2)   Estimated  solely for the purpose of  calculating  the  registration  fee,
      pursuant to Rule 457(c).

                                  ------------

      THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES  ACT OF 1933 OR UNTIL THIS  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

================================================================================




<PAGE>
================================================================================
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
================================================================================

                 SUBJECT TO COMPLETION -- DATED JANUARY 27, 1997

PROSPECTUS
- ----------
                                 400,000 Shares
                    CELLULAR TECHNICAL SERVICES COMPANY, INC.
                                  Common Stock

           This  Prospectus  relates to an aggregate of 400,000 shares of common
stock (the  "Common  Stock") of Cellular  Technical  Services  Company,  Inc., a
Delaware corporation (the "Company"), which may be offered and sold from time to
time by the Selling  Shareholders named herein. The Company will not receive any
of the  proceeds  from the sale of the shares of Common  Stock being sold by the
Selling Shareholders. See "Selling Shareholders."

           The  shares of Common  Stock may be offered  for sale by the  Selling
Stockholders  from time to time in the  over-the-counter  market,  in  privately
negotiated  transactions or otherwise at market prices prevailing at the time of
sale,  at prices  related  to such  prevailing  market  prices or at  negotiated
prices.  The  shares  of  Common  Stock  may be  sold  directly  by the  Selling
Stockholders or through underwriters, brokers or dealers. In connection with any
such sales,  the Selling  Stockholders  and brokers or dealers  participating in
such sales may be deemed "underwriters" within the meaning of the Securities Act
or  1933,  as  amended  ("Securities  Act"),  and  any  discounts,  commissions,
concessions  and any  profits  realized by them on the sale of the Shares may be
deemed to be underwriting compensation under the Securities Act. At such time as
Rule 144 ("Rule 144") promulgated under the Securities Act becomes available for
the sale of such shares, such shares may be sold under Rule 144 instead of under
this  Prospectus,  subject  to  compliance  with the  volume  and manner of sale
limitations,  as well as the  other  requirements,  of Rule  144.  See  "Plan of
Distribution".

           The Common  Stock is included in The Nasdaq Stock  Market's  National
Market (the "Nasdaq  National  Market")  under the symbol "CTSC." On January 22,
1997, the last reported sales price for the Common Stock on the Nasdaq  National
Market was $16.625 per share.

                              ---------------------

             SEE "RISK FACTORS" BEGINNING ON PAGE 6 FOR A DISCUSSION
              OF CERTAIN MATERIAL FACTORS THAT SHOULD BE CONSIDERED
                    IN CONNECTION WITH AN INVESTMENT IN THE
                          COMMON STOCK OFFERED HEREBY.

                              ---------------------

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
          COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
            ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY
              OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
                       THE CONTRARY IS A CRIMINAL OFFENSE.

                              ---------------------


                The date of this Prospectus is             , 1997


<PAGE>


                              AVAILABLE INFORMATION


           The  Company  is  subject to the  informational  requirements  of the
Exchange Act and, in accordance  therewith files reports,  proxy  statements and
other   information   with  the   Securities   and  Exchange   Commission   (the
"Commission"). Such reports, proxy statements and other information filed by the
Company  can  be  inspected  and  copied  at  the  public  reference  facilities
maintained by the Commission at Room 1024,  Judiciary  Plaza,  450 Fifth Street,
N.W.,  Washington,  D.C. 20549, and at the Commission's Regional Offices located
at 7 World Trade  Center,  13th  Floor,  New York,  New York 10048 and  Citicorp
Center,  500 West Madison  Street,  Suite 1400,  Chicago,  Illinois  60661-2511.
Copies of such material can also be obtained at prescribed rates from the Public
Reference  Section of the Commission,  Judiciary Plaza, 450 Fifth Street,  N.W.,
Washington, D.C. 20549. The Commission maintains a Web site (http://www.sec.gov)
that contains  reports,  proxy and information  statements and other information
electronically  filed  through  the  Commission's   Electronic  Data  Gathering,
Analysis and Retrieval system ("EDGAR"). The Common Stock is currently quoted on
The Nasdaq  Stock  Market and such  reports  and other  information  can also be
inspected at the offices of Nasdaq Operations,  1735 K Street, N.W., Washington,
D.C. 20006.

           The Company has filed with the Commission,  Washington, D.C. 20549, a
Registration  Statement (No. 333- ) under the Securities Act with respect to the
shares of Common Stock (the "Registration Statement"). As permitted by the rules
of the  Commission,  this Prospectus does not contain all of the information set
forth in the  Registration  Statement  and the  exhibits  thereto.  For  further
information  with respect to the Company and the shares of Common Stock  offered
hereby,  reference is made to the Registration  Statement and the exhibits filed
therewith.  Statements  contained  in  this  Prospectus,  and  in  any  document
incorporated  herein by  reference,  as to the  contents of any  contract or any
other document  referred to are not necessarily  complete and, in each instance,
reference  is made to the copy of such  contract or other  document  filed as an
exhibit to the  Registration  Statement or such  document,  each such  statement
being  qualified in all respects by such reference.  A copy of the  Registration
Statement may be inspected without charge at the Commission's  principal office,
Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington,  D.C. 20549, and
copies of all or any part of the  Registration  Statement  may be obtained  from
such office  upon the  payment of the fees  prescribed  by the  Commission.  The
Registration  Statement  has  been  filed  through  EDGAR  and is also  publicly
available through the Commission's Web site (http://www.sec.gov).

                      INFORMATION INCORPORATED BY REFERENCE

           The  following  documents  heretofore  filed by the Company  with the
Commission are incorporated herein by reference: (1) the Company's Annual Report
on Form 10-K for the year ended December 31, 1995;  (2) the Company's  Quarterly
Reports on Form 10-Q under the  Exchange  Act for the  quarters  ended March 31,
1996,  June 30,  1996,  and  September  30,  1996,  (3) the  description  of the
Company's Common Stock contained in the Company's Registration Statement on Form
8-A and any amendment or report filed by the Company for the purpose of updating
such description.  Each document filed pursuant to Sections 13(a),  13(c), 14 or
15(d)  of the  Exchange  Act by the  Company  subsequent  to the  date  of  this
Prospectus  but prior to the  termination of this offering shall be deemed to be
incorporated  by reference in this  Prospectus  and to be a part hereof from the
date of the filing of such documents. Any statement contained in this Prospectus
or in a document  incorporated or deemed to be incorporated  herein by reference
shall be deemed to be modified or superseded for purposes of this  Prospectus to
the extent that a statement  contained herein or in any other subsequently filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies or supersedes such  statement.  Any statement so modified or superseded
shall not be deemed,  except as so modified or superseded,  to constitute a part
of this Prospectus.

           THE COMPANY WILL PROVIDE,  WITHOUT CHARGE, TO EACH PERSON,  INCLUDING
ANY BENEFICIAL  OWNER, TO WHOM A COPY OF THIS PROSPECTUS IS DELIVERED,  UPON THE
WRITTEN OR ORAL REQUEST OF ANY SUCH PERSON, A COPY OF ANY DOCUMENT  INCORPORATED
BY REFERENCE IN THIS  PROSPECTUS  (OTHER THAN EXHIBITS  UNLESS SUCH EXHIBITS ARE
EXPRESSLY  INCORPORATED  BY REFERENCE  IN SUCH  DOCUMENTS).  REQUESTS  SHOULD BE
DIRECTED TO CELLULAR  TECHNICAL  SERVICES  COMPANY,  INC.,  2401 FOURTH  AVENUE,
SEATTLE,  WASHINGTON 98121, ATTENTION:  MICHAEL E. MCCONNELL, VICE PRESIDENT AND
CHIEF FINANCIAL OFFICER.



                                       -2-

<PAGE>



                                   THE COMPANY

           The  mission  of the  Company  is to be  the  premier  developer  and
provider of real-time information  processing and information management systems
for the wireless  communications industry in the United States and international
markets.  The Company designs and engineers  software and hardware  products for
sale  to  the   wireless   communications   industry   to  provide   user/device
authentication  (for "cloning" fraud prevention) and to provide service metering
(for credit management and prepaid billing). Although the Company's products and
services  currently are used exclusively by cellular telephone system operators,
commonly known as carriers, the Company believes they may be generally adaptable
to other wireless communications systems.

           User/device   authentication  primarily  involves  various  forms  of
"pre-call"  verification  to ensure  that the use of a  wireless  communications
device (e.g., a cellular  telephone) is legitimate  before the device is allowed
to  connect  to  a  wireless  network.  The  Company's   Blackbird(R)   Platform
("Blackbird   Platform")   provides  the  underlying   technology  for  pre-call
application  products.  The first application product on the Blackbird Platform,
PreTect(TM)  ("PreTect"),  is designed to proactively prevent cloning fraud. The
Cellular  Telecommunications Industry Association ("CTIA") has estimated that in
1995  cloning  fraud has  resulted in costs and lost  revenues  to the  domestic
cellular  industry of an amount in excess of $650 million.  The Company believes
that in 1996 cloning fraud will result in even greater costs and lost  revenues.
Cloning fraud is the term used by the cellular  industry to describe the illegal
activity  of using a  cellular  telephone  whose  electronic  serial  number and
telephone  number have been altered to match those of a legitimate  subscriber's
telephone.

           Service metering  primarily  involves the collection of various forms
of "post-call"  information (within minutes after the end of the call) to ensure
that a wireless communications carrier's subscriber has proper account status to
make additional calls. The Company's  Hotwatch(R) Platform ("Hotwatch Platform")
provides  the  underlying  technology  for  post-call  application  products and
services for credit management and prepaid billing ("Hotwatch Products").

           The  Blackbird  and  Hotwatch  Platforms,  each based on open systems
architecture,  are  designed  to  allow a broad  range  of  interconnection  and
data-sharing  possibilities  between  various  geographic  markets and different
wireless communications carriers.

           The  Company's  primary  activities  are  the  further   development,
marketing and deployment of the Blackbird Platform, the PreTect fraud prevention
application and other related products and services (the "Blackbird  Products").
PreTect,   which  is  transparent  to  the  subscriber,   uses  patented  signal
processing,  commonly  referred to as radio  frequency  ("RF")  "fingerprinting"
technology,   to  accurately  distinguish  between  legitimate  subscribers  and
counterfeit  users before the call is connected.  PreTect  captures  information
from the  cellular  telephone  call at the  cell  site,  before  it  enters  the
carrier's  system,  and compares it to valid  fingerprints and data. If a proper
match is not made,  PreTect can then  automatically  prevent  connection  of the
call.  The  Company  also  offers its No Clone  ZoneSM  service  ("No Clone Zone
Service"), a seamless real-time roaming fraud prevention service between markets
that use the Blackbird  Platform and PreTect.  During 1996, the Company  entered
into agreements with AirTouch Cellular ("AirTouch"),  Bell Atlantic NYNEX Mobile
("BANM"),  GTE Mobilnet of  California,  L.P.  ("GTE-California")  and Ameritech
Mobile  Communications,  Inc.  ("Ameritech"),  establishing terms for the use of
Blackbird Products in their markets.  The Company believes that as of the end of
1996 there were in excess of 23,000 domestic and 10,000 international cell sites
to which the  Company's  Blackbird  Products  are  adaptable.  The Company  also
believes there are approximately  14,000 additional  international cell sites to
which the Company's Blackbird Products may be adaptable.



                                       -3-

<PAGE>



           During the last ten years, wireless  communications  service has been
one of the fastest growing segments of the telecommunications industry. The CTIA
has  estimated  that the number of  cellular  subscribers  in the United  States
increased   from   approximately   340,000   subscribers  in  December  1985  to
approximately 34 million  subscribers in December 1995. The Company believes the
worldwide wireless communications market exceeded 100 million subscribers at the
end of 1996. The Company expects  significant growth in wireless  communications
in the United  States to continue in the  future,  as a result of the  increased
demand  for  cellular  service  and the  emergence  of  personal  communications
services  ("PCS") as a new form of  wireless  communications  service,  and that
significant  growth  will  also  occur in  international  markets.  The  Company
believes that the number of cellular and PCS  subscribers may grow to 80 million
in the United States and more than 300 million  worldwide in the year 2001.  The
Company  believes  that the demand for its products and services may increase as
the Company  adapts its products and creates new products to service an expanded
wireless communications industry.

           The  Company  was  incorporated  in Delaware in August 1988 under the
name  NCS  Ventures  Corp.  ("Ventures")  as  a  majority-owned   subsidiary  of
Nationwide Cellular Service, Inc. ("Nationwide"),  a publicly traded company. In
September  1988,  Ventures  formed,  as equal partners with NYNEX Mobile Billing
Services,  Inc.  ("NYNEX"),  a partnership,  Cellular Technical Services Company
(the  "Partnership").  In May  1991,  Ventures  changed  its  name  to  Cellular
Technical Services Company, Inc. In August 1991, the Company exercised an option
to purchase the interest in the  Partnership  owned by NYNEX and consummated the
initial public offering of its securities.  In 1995,  concurrent with the merger
of Nationwide  into MCI  Communications  Corp.,  Nationwide  distributed  to its
stockholders all of its shares of the Company's Common Stock.

           The Company's  principal  offices are located at 2401 Fourth  Avenue,
Seattle, Washington, 98121 and its telephone number is (206) 443-6400.

                               RECENT DEVELOPMENTS

           On November 8, 1996,  the Company  entered into an agreement with the
Selling  Shareholders  (the "Stock  Purchase  Agreement")  pursuant to which the
Company  sold an  aggregate  of 400,000  shares of Common  Stock to the  Selling
Shareholders for a total purchase price of $6,500,000.  Pursuant to the terms of
the Stock  Purchase  Agreement,  the  Company  agreed  to file the  Registration
Statement  with  respect  to the  resale  of such  Common  Stock by the  Selling
Shareholders.  The  Company  also  agreed to use its best  efforts  to cause the
Registration  Statement to become  effective as soon as practicable and to cause
the Registration  Statement to remain effective until the earlier of the sale by
the  Selling  Shareholders  of all  shares  registered  under  the  Registration
Statement or 360 days after the effective date of the Registration Statement.

           The Stock Purchase Agreement also provided that the Company would pay
all costs and  expenses  incurred in  connection  with the  registration  of the
Common Stock registered pursuant to the Registration Statement,  except that the
Company  would not be  responsible  for paying the Selling  Shareholders'  legal
costs or brokerage commissions incurred in connection with such offering.

           The  Company  recognizes  revenues  for  its  products  according  to
accounting methods in which operating costs (system  development,  installation,
training and  testing)  are  expensed in the period in which they were  incurred
while revenues and product costs associated with product  shipments are deferred
and recorded when contract milestones are met, as defined in customer contracts.
Using this accounting  method,  the Company expects to recognize revenue on only
about half of the total number of Blackbird(R) Platform units that were deployed
during the fourth  quarter of 1996, or  approximately  $6 million to $7 million,
while a similar  amount of revenue will be deferred  with  recognition  expected
during the first  quarter of 1997 as contract  criteria are met.  The  estimated
revenue for the fourth  quarter of 1996 compares  with $3.2 million  reported in
the same period in 1995.  Based on estimated  expenses for the fourth quarter of
1996, the


                                       -4-

<PAGE>



Company expects to report a loss ranging from  approximately  $0.09 to $0.14 per
share  for the  period  as  compared  to a net  profit of $0.02 per share in the
fourth quarter of 1995.

           In  January  1997,  the  Company  signed a Letter of Intent  with GTE
Mobilnet of Virginia  ("GTE-Virginia")  to deploy Blackbird  Products for use in
GTE-Virginia's  "B-Band" cellular markets throughout  Virginia.  The Company and
GTE-Virginia  are currently  negotiating a definitive  agreement and the Company
expects that deployment of its products will begin in the first quarter of 1997.

           In an action brought against the Company by Reon International  Corp.
and Reon Corp. in the Superior Court of King County,  Washington, the plaintiffs
allege  breach of contract,  misappropriation  of trade  secrets,  and breach of
other  obligations  by the Company.  The action was filed in late July 1996 and,
since that time, a significant  number of the  plaintiffs'  initial  claims have
been dismissed.  The plaintiffs  have amended their complaint three times,  most
recently in January 1997, and now allege that certain  transactions  between the
parties constitute a joint venture partnership.  The plaintiffs seek dissolution
of the alleged joint venture partnership,  damages in excess of $10 million, and
other relief.  The Company has formally denied all of the plaintiffs' claims and
is  vigorously  defending  this  action.  It is the  opinion  of  the  Company's
management  that this  action is without  merit and will be  resolved  without a
material adverse effect on the Company.

                SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

           A  number   of   statements   contained   in  this   Prospectus   are
forward-looking   statements  within  the  meaning  of  the  Private  Securities
Litigation  Reform Act of 1995 that involve risks and  uncertainties  that could
cause actual results to differ materially from those expressed or implied in the
applicable statements. These risks and uncertainties include but are not limited
to:  the  Company's  dependence  on  the  cellular  communications  market;  its
vulnerability  to rapid  industry  change and  technological  obsolescence;  the
limited nature of its product life, and the uncertainty of market  acceptance of
its products;  the unproven status of its products in widespread commercial use,
including the risks that its current and future products may contain errors that
would be  difficult  and costly to detect  and  correct  and that  technological
difficulties may in general hinder or prevent  commercialization  of its present
and   future   products;   potential   manufacturing   difficulties;   potential
difficulties  in managing  growth;  dependence on key  personnel;  the Company's
limited  customer  base and reliance on a relatively  small number of customers;
the possible impact of competitive  products and pricing; the uncertain level of
actual  purchases of its  products by current and  prospective  customers  under
existing  and  future  agreements;  uncertainties  in the  Company's  ability to
implement these agreements  sufficiently to permit it to recognize revenue under
its  accounting  policies  (including  its ability to meet  product  performance
criteria  contained  in such  contracts);  the  results  of  financing  efforts;
uncertainties with respect to the Company's business strategy;  general economic
conditions; and other risks described in this Prospectus and the Company's other
filings with the Commission.





                                       -5-

<PAGE>



                                  RISK FACTORS

           An investment in the shares of Common Stock offered hereby involves a
high  degree  of risk.  Prospective  investors  should  carefully  consider  the
following risk factors,  in addition to the other  information set forth in this
Prospectus,  in  connection  with an  investment  in the shares of Common  Stock
offered hereby.

           Dependence   on   Cellular   Market;   Rapid   Industry   Change  and
Technological  Obsolescence.  The  Company's  future  success will depend on the
continued  and  expanded  use of its existing  products  and  services,  and its
ability to develop new  products  and  services or adapt  existing  products and
services to keep pace with changes in the wireless communications  industry. The
Company  historically  has provided its  products  and services  exclusively  to
cellular  carriers.  In  addition,  the  Company's  user/device   authentication
products  currently  are  designed to provide  security  exclusively  for analog
cellular  telephones.  The Company believes that over [90%] of domestic cellular
telephone  service  currently  is  provided  in the  analog  mode,  but that the
industry  is  undertaking  a shift to digital  mode in the major  markets due to
certain advantages of the digital mode,  including  expanded  capacity,  greater
privacy and enhanced  security.  Technological  changes or  developments  in the
cellular  industry,   such  as  encryption   technology  for  enhanced  privacy,
"Authentication"  ("A-Key")  technology for enhanced  security  against  cloning
fraud, improved switching technologies, or further industry consolidation, could
reduce  or  eliminate  demand  for  the  Company's  user/device   authentication
products. A rapid shift away from the use of analog cellular telephones in favor
of digital cellular  telephones  utilizing A-Key or to other wireless  services,
such as PCS,  could affect demand for the Company's  user/device  authentication
products  and could  require  the  Company to develop  modified  or  alternative
user/device authentication products addressing the particular needs of providers
of such  new  services.  There  can be no  assurance  that the  Company  will be
successful  in  modifying  or  developing  its  existing  or future  user/device
authentication products in a timely manner, or at all. If the Company is unable,
due to resource, technological or other constraints, to adequately anticipate or
respond  to  changing  market,  customer  or  technological  requirements,   the
Company's  business,  financial  condition  and  results of  operations  will be
materially adversely affected.  Further, there can be no assurance that products
or services  developed  by others  will not render the  Company's  products  and
services non-competitive or obsolete.

           Limited Product Line;  Uncertainty of Widespread  Market  Acceptance.
The  Company's  revenues have been and can be expected to continue to be derived
from a limited number of products and services.  The Company  recently  expanded
its product line with the introduction of the Blackbird  Products.  Although the
Company  believes  that  the  Blackbird  Products  present   significant  growth
opportunities for its business,  there can be no assurance that the Company will
derive significant revenues from the commercialization of such technology or any
other  products.  By virtue of the  signing of certain  contracts  in 1996,  the
Company  commenced the commercial  installation  of the Blackbird  Products in a
number  of  major  cellular  markets.  Such  installations  are  subject  to the
Blackbird  Products'   compliance  with  contractual   requirements,   including
acceptance  testing to ensure that the Blackbird Products are properly installed
and performing in accordance with  contractual  specifications.  Given the early
stage of  commercial  use,  however,  there can be no  assurance  that any given
installation  of  Blackbird  Products  will  satisfy  contractual  requirements.
Additionally,  achieving  widespread  market  acceptance and  penetration of the
Blackbird  Products and the Company's  other products and services will, in some
cases,  require  additional  enhancements and improvements to those products and
services and increased  marketing  efforts to  effectively  compete and increase
customer  awareness  of the  Company's  products and  services.  There can be no
assurance,  however,  that such  additional  enhancements  and  improvements  or
increased  marketing  and  sales  efforts  will  result  in  a  more  successful
commercialization and increased market penetration of the Company's products and
services.

           Technological Factors;  Uncertainty of Product Development;  Unproven
Technology.  The Company's  products are currently  being  utilized by a limited
number of customers and there can be no assurance that they


                                       -6-

<PAGE>



will prove to be  sufficiently  reliable  in  widespread  commercial  use. It is
common  for  hardware  and  software  as  complex  and   sophisticated  as  that
incorporated  in the  Company's  products  to  experience  errors or "bugs" both
during development and subsequent to commercial introduction. In particular, the
Company has  identified  certain  software and hardware  errors in its Blackbird
Products and to date corrected  some, but not all, of such errors.  There can be
no assurance that any errors in the Company's  existing or future  products will
be  identified,  and if  identified,  corrected.  Any such  errors  could  delay
commercial  introduction of new products and require  modifications  in products
that  have  already  been  installed.  Remedying  such  errors  has been and may
continue to be costly and time  consuming.  Delays in remedying  any such errors
could  materially  adversely  affect the  Company's  competitive  position  with
respect to existing or new technologies and products offered by its competitors.
In  particular,  delays in remedying  existing or future errors in the Company's
Blackbird  Products could materially  adversely affect the Company's  ability to
achieve  significant market penetration prior to the possible  widespread use of
A-Key. In addition,  software and hardware  warranties are generally included as
part of the Company's  obligations  under its agreements with its customers.  To
date,  the costs to the Company of meeting the  Company's  warranty  obligations
relating  to  its  Hotwatch  Products  have  not  been   substantial.   Warranty
obligations  related to the  Blackbird  Products  have been and are  expected to
continue to be greater than those  encountered with Hotwatch Products due to the
expanded customer base for Blackbird  Products.  However, to the extent that the
software  and  hardware  maintenance  fees from its products are not adequate to
cover the costs of making any necessary  modifications  or meeting the Company's
warranty  obligations,  the  Company  could  be  required  to  make  significant
additional  expenditures,  which  could  have a material  adverse  effect on the
Company.  The Company is continually seeking to enhance and improve its existing
products and services and to develop new products and services,  including other
application   products   utilizing  the   Blackbird   and  Hotwatch   Platforms.
Accordingly,  the Company  remains  subject to all of the risks  inherent in new
product  development,  including  unanticipated  technical or other  development
problems which could result in material delays in product  commercialization  or
significantly  increased costs.  There can be no assurance that the Company will
be able to  successfully  enhance or improve  existing  products  or develop new
products.

           Risk of New Hardware Manufacturing Activities. For the most part, the
Company's  engineering  resources  historically  have been  devoted to  software
design and  development.  As a result,  only a limited  number of such resources
were  initially  used in the design and  prototype  production  of the Company's
proprietary  hardware. In recent quarters the Company has added significantly to
its hardware design and development process. In addition,  the Company continues
to  utilize  a  number  of  subcontractors  for  hardware  design,  engineering,
manufacturing  and  integration of certain  proprietary  printed circuit boards,
radio  equipment and other  subassemblies  which are components of the Company's
Blackbird  Products.  The  Company's  future  success will continue to depend on
enhancing and expanding its manufacturing  activities with respect to the design
and  engineering  of  hardware,   improving  its  inventory   control   systems,
maintaining effective quality control, procuring component parts and maintaining
subcontractor relationships.  Failure to achieve any of these factors could have
a material  adverse effect on the Company's  business,  financial  condition and
results of operations.

           Ability to Manage  Growth.  The Company has expanded  its  operations
rapidly, which has created significant demands on the Company's  administrative,
operational, development and financial personnel and other resources. Additional
expansion by the Company may further strain the Company's management,  financial
and other  resources.  There can be no  assurance  that the  Company's  systems,
procedures, controls and existing space will be adequate to support expansion of
the Company's  operations.  The Company's future operating  results will depend,
among other things, on its ability to manage changing business conditions and to
continue to improve its operational and financial control and reporting systems.
If the  Company's  management  is  unable  to  manage  growth  effectively,  its
business,  financial  condition  and results of  operations  could be materially
adversely affected.  The Company's ability to manage growth depends in part upon
the  Company's  ability  to  attract,  train and retain a  sufficient  number of
qualified personnel or independent contractors commensurate with the


                                       -7-

<PAGE>



expanding  needs of the  Company.  An  increase in the  turnover  rate among the
Company's employees would increase the Company's  recruiting and training costs,
and if the  Company  were unable to recruit  and retain a  sufficient  number of
employees or independent contractors,  it could be forced to limit its growth or
possibly curtail its operations. There can be no assurance that the Company will
be successful  in  attracting,  training and  retaining  the required  number of
qualified employees or independent contractors to support the Company's business
in the future.

           Dependence on Key Personnel.  The Company's future success depends in
large part on the continued services of its key management,  sales, engineering,
research  and  development  and  operational  personnel  and on its  ability  to
continue  to  attract,  motivate  and  retain  highly  qualified  employees  and
independent  contractors  in those  areas.  Competition  for such  personnel  is
intense and there can be no  assurance  that the Company will be  successful  in
attracting,  motivating and retaining key  personnel.  The inability to hire and
retain  qualified  personnel or the loss of the services of key personnel  could
have a material adverse effect upon the Company's business,  financial condition
and results of operations.  The Company has entered into  employment  agreements
with,  among others,  its Chief  Financial  Officer  (which  expires in December
1997),  Vice  President,  Engineering  (which  expires in July 1998) and General
Counsel (which expires in August,  1997).  There can be no assurance that any of
these contracts will be renewed.  The Company does not maintain any key-man life
insurance policies on any of its employees.

           Limited  Customer  Base;  Reliance  on  Significant  Customers.   The
Company's  potential  customer base is relatively limited due to the significant
concentration of ownership and/or operational control of wireless  communication
markets.  Currently,  the Company  markets its  services  and  products  only to
cellular carriers,  of which there are 27 in the United States and approximately
150 in  international  markets.  There can be no assurance  that any  customers,
current or future,  will maintain business  relationships with the Company.  See
"--  International  Operations."  Revenues  attributable  to a relatively  small
number  of  customers  historically  have  represented  and are  likely  for the
foreseeable  future to continue to represent a  significant  percentage,  in any
given period,  of the Company's total revenues.  Sales to customers  aggregating
10% or more,  either  individually  or  combined  as  affiliates  due to  common
ownership,  were concentrated as follows: three customers with sales of 40%, 32%
and 13% during the nine months ended  September  30, 1996;  and three  customers
with sales of 59%, 15% and 12%,  three  customers with sales of 54%, 22% and 11%
and two  customers  with sales of 56% and 24% in the years  ended  December  31,
1995,  1994 and  1993,  respectively.  The  aggregate  sales to these  customers
represented  85%,  86%, 87% and 80% of the  Company's  total product and service
revenues  during the nine months ended  September 30, 1996,  and the three years
ended  December 31,  1995,  respectively.  There can be no  assurance  that such
customers will continue to maintain business relationships with the Company. The
Company has recently signed  contracts with new customers which, if successfully
implemented and performed, would generate significant revenue. However, the loss
of one or more  major  customers  could have a  material  adverse  effect on the
Company's business, financial condition and results of operations.

           Competition.  The market for the  Company's  products and services is
highly competitive and subject to rapid change. A number of companies  currently
offer one or more  similar  products and  services  offered by the  Company.  In
addition,  many wireless  communications  carriers are providing or can provide,
in-house,  certain of the Hotwatch  Products that the Company offers.  Trends in
the  wireless  communications  industry,  including  greater  consolidation  and
technological or other developments that make it simpler or more  cost-effective
for wireless  communications  carriers to provide certain  services  themselves,
could affect  demand for the  Company's  products and services and could make it
more  difficult  for the  Company  to offer a  cost-effective  alternative  to a
wireless  communications  carrier's  own  capabilities.  Current  and  potential
competitors  have  established  or  may in the  future  establish  collaborative
relationships  among  themselves or with third parties,  including third parties
with whom the Company has a relationship, to increase the visibility and utility
of their products and services.


                                       -8-

<PAGE>



Accordingly,  it is possible  that new  competitors  or alliances may emerge and
rapidly acquire  significant market share. In addition,  the Company anticipates
continued growth in the wireless communications industry and, consequently,  the
entrance of new  competitors  in the future.  An increase in  competition  could
result in price  reductions  and loss of market  share and could have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.

           The Company  believes that the principal  competitive  factors facing
the  Company in the  wireless  communications  industry  include  the ability to
identify and respond to customer needs,  the quality and breadth of products and
services, technical expertise and price. To remain competitive, the Company will
need to continue to invest in research  and  development,  sales and  marketing,
customer service, manufacturing activities and administrative systems. There can
be no  assurance  that the Company will have  sufficient  resources to make such
investments or that the Company will be able to make the technological  advances
necessary to remain  competitive.  Many of the  Company's  current and potential
competitors have significantly greater financial, marketing, technical and other
competitive resources, as well as greater name recognition, than the Company. As
a result, the Company's  competitors may be able to adapt more quickly to new or
emerging  technologies  and changes in customer  requirements  or may be able to
devote  greater  resources  to the  promotion  and  sale of their  products  and
services.  There can be no  assurance  that the Company  will be able to compete
successfully  with  its  existing  competitors  or  with  new  competitors.  The
Company's  principal  competitors  in the service  metering  field  include IBM,
I-NET,  Inc.,  GTE  Telecommunications   Services,   Inc.  ("GTE-TSI"),   Boston
Communications Group, EDS Personal Communications  Corporation,  Cincinnati Bell
Information Systems, Inc.,  Lightbridge,  Inc., Subscriber Computing,  Inc., CSC
Intellicom,  Systems/Link  Corporation,  Brite Voice Systems, Inc. and Orga Card
Systems  Inc.  The   Company's   principal   competitors   in  the   user/device
authentication field include Corsair  Communications,  Inc.  ("Corsair"),  Coral
Systems,  Inc. ("Coral") (in connection with a joint venture with Applied Signal
Technology),  Authentix Network,  Inc., GTE-TSI and Signal Science  Incorporated
("Signal Science"). The Company believes that Corsair has agreements pursuant to
which  Corsair has installed or will install its RF-based  fingerprinting  fraud
protection product in a number of major markets. The Company has no knowledge of
any such agreements or installations  by others,  although others may be testing
or  developing  such  products.  In  addition,  there  are  numerous  companies,
including wireless  communications  carriers,  hardware and software development
companies  and  others,  which have or may  develop  the  expertise  which would
encourage  them to attempt to develop and market  products (such as A-Key) which
could render the Company's products obsolete or less marketable.

           History of Net Losses;  Accumulated Deficit. Although the Company had
net income of $63,187  for the year ended  December  31,  1995 and net income of
$1,549,871  for the year ended  December 31, 1994,  the Company  sustained a net
loss in each of the preceding  years,  had net income of $54,230 for the quarter
ended September 30, 1996, had a net loss of $4,436,767 for the nine months ended
September 30, 1996,  and, at September 30, 1996, had an  accumulated  deficit of
$8,063,031.  In  addition,  in the event that the Company is not  successful  in
generating sufficient future product revenues, the carrying value of capitalized
software development costs,  inventories and other assets could be significantly
impaired.  There  can be no  assurance  that the  Company's  operations  will be
profitable in the future. See "Recent Developments."

           International  Operations.  The Company is marketing its products and
services in international  markets. In pursuing such opportunities,  the Company
is  and  will  remain  subject  to  all  the  risks  inherent  in  international
transactions,  such as  changes  in  export,  import,  tariff  and  other  trade
regulations,  currency  exchange  rates,  foreign  tax laws,  and  other  legal,
economic,  and political  conditions.  There can be no assurance that changes in
any of the foregoing  will not have a material  adverse  effect on the Company's
business,  financial condition and results of operations.  Further,  the laws of
certain foreign countries do not protect the Company's  intellectual property to
the same extent as the laws of the United States. See " -- Proprietary  Rights".
In certain international markets,


                                       -9-

<PAGE>



the  Company  will need to modify  its  products  or develop  new or  additional
products to adapt to the different  wireless  technologies or network  standards
utilized by the carriers in such  markets.  There can be no  assurance  that the
Company's  marketing  efforts  and  technological  enhancements  will  result in
successful  commercialization  or  market  acceptance  or  penetration  in  such
international  markets.  If the Company is unable to adequately  anticipate  and
respond  to  marketing  or  technological   requirements  in  the  international
marketplace,   the  Company's  business,  financial  condition  and  results  of
operation could be materially adversely affected.

           Fluctuations  in Quarterly  Performance.  The Company has experienced
fluctuations  in its  quarterly  operating  results  and  anticipates  that such
fluctuations  will  continue  and  could  intensify.   The  Company's  quarterly
operating  results  may vary  significantly  depending  on a number of  factors,
including  the timing of the  introduction  or  acceptance  of new  products and
services  offered by the  Company,  changes in the mix of products  and services
provided by the Company, long sales cycles, changes in regulations affecting the
wireless industry,  changes in the Company's operating expenses,  uneven revenue
streams, and general economic conditions.  Revenue recognition for the Company's
products is based upon various performance  criteria and varies from customer to
customer and product to product.  Hardware  and  software  delivery and customer
acceptance  in  accordance  with  contractual   definitions  are  generally  the
significant  factors used in determining  revenue  recognition.  There can be no
assurance that the Company's levels of profitability will not vary significantly
among  quarterly  periods  or that in future  quarterly  periods  the  Company's
results of  operations  will not be below prior results or the  expectations  of
public market analysts and investors.  In such event, the price of the Company's
Common Stock could be materially adversely affected. See "Recent Developments."

           Dependence  on  Third-Party  Vendors.  The  Company has been and will
continue to be dependent on third-party vendors for computer equipment,  network
services,  component  parts,  manufacturing,  systems  integration  and  certain
software  all of which are  incorporated  in its products  and  services.  While
available  from  multiple  sources,  the Company  currently  obtains or licenses
certain  equipment and software from a limited  number of sources.  Although the
Company believes that there are currently  available  substitute sources for all
such equipment and software,  the Company could be required to redesign affected
products  to  accommodate   substitutes   therefor.  In  an  attempt  to  ensure
satisfactory  sources of supply,  the  Company  currently  maintains  supply and
software license arrangements with various suppliers. There can be no assurance,
however,  that the  Company  will be able to  procure  necessary  equipment  and
software on a satisfactory and timely basis. For example,  from time to time the
electronic  computer  component parts industry has experienced  parts allocation
restrictions.  Any failure or delay in obtaining necessary equipment,  component
parts  or  software,  or  if  necessary,  establishing  alternative  procurement
arrangements,  could cause delays in product commercialization and could require
product  redesign or  modification.  There can be no assurance  that the Company
could complete any necessary  modifications  in a timely manner or that modified
or redesigned  products  would  maintain  current  functionality  or performance
features or could be  successfully  commercialized.  Any  inability  or delay in
establishing  necessary  procurement   arrangements  or  successfully  modifying
products  could  have a  material  adverse  effect  on the  Company's  business,
financial condition and results of operations.

           Possible Need for Additional Financing. In the event of unanticipated
technical or other problems,  or if the funds currently available to the Company
prove to be insufficient to fund operations, the Company may be required to seek
additional  financing  sooner than  currently  anticipated or may be required to
curtail its activities. There can be no assurance that additional financing will
be available on acceptable terms, or at all.

           Proprietary  Rights. The Company's success will depend in part on its
ability  to  protect  its  technology,   processes,   trade  secrets  and  other
proprietary  rights from unauthorized  disclosure and use and to operate without
infringing the proprietary rights of third parties. The Company's strategy is to
protect its technology and other proprietary rights through patents, copyrights,
trademarks, nondisclosure agreements, license agreements, and


                                      -10-

<PAGE>



other forms of  protection.  The  Company  has been  active in  pursuing  patent
protection  for  technology  and processes  involving its Hotwatch  Products and
Blackbird Products that it believes to be proprietary and that offer a potential
competitive  advantage for the Company's  products and  services.  To date,  the
Company has been granted  patents on certain  features of the Hotwatch  Products
and has patents  pending  for certain  features  of the  Hotwatch  Products  and
Blackbird  Products.  In addition,  the Company has also  licensed  patents from
third parties in an effort to maintain flexibility in the development and use of
its technology,  including exclusive and non-exclusive  rights to use patents in
connection with the Blackbird Products. There can be no assurance, however, that
any pending or future patent  application  of the Company or its licensors  will
result in issuance of a patent,  that the scope of  protection  of any patent of
the Company or its licensors will be held valid if subsequently  challenged,  or
that third  parties  will not claim  rights in or  ownership of the products and
other proprietary rights held by the Company or its licensors.  In addition, the
laws of certain  foreign  countries  do not protect the  Company's  intellectual
property rights to the same extent as the laws of the United States.

           Litigation   or  regulatory   proceedings,   which  could  result  in
substantial  cost and  uncertainty  to the  Company,  may also be  necessary  to
enforce  patent or other  proprietary  rights of the Company or to determine the
scope and validity of a third party's proprietary  rights.  Although the Company
believes  that its  technology  has been  independently  developed  and that its
products do not infringe patents known to be valid or violate other  proprietary
rights of third parties,  it is possible that such  infringement  of existing or
future  patents or violation of  proprietary  rights may occur.  There can be no
assurance that third parties will not assert  infringement  claims in the future
with respect to the Company's current or future products or that any such claims
will not result in litigation or regulatory  proceedings  or require the Company
to modify its products or enter into licensing  arrangements,  regardless of the
merits of such claims. No assurance can be given that any necessary licenses can
be obtained in a timely manner,  upon commercially  reasonable terms, or at all,
and no assurance  can be given that third  parties will not assert  infringement
claims with respect to any current licensing arrangements. The Company's failure
to successfully  enforce its proprietary  rights or defend against  infringement
claims  brought by third parties could have a material  adverse  effect upon the
Company.  In addition,  there can be no assurance that the Company will have the
resources  necessary to successfully  defend an infringement  claim brought by a
third party.

           In  addition  to the  foregoing  methods of  protection,  the Company
employs various physical security measures to protect its software source codes,
technology and other proprietary rights.  However,  such measures may not afford
complete  protection  and  there  can  be no  assurance  that  others  will  not
independently  develop  similar  source codes,  technology or other  proprietary
rights or obtain access to the Company's  software codes,  technology,  or other
proprietary  rights.  Furthermore,  although  the  Company  has and  expects  to
continue  to have  internal  nondisclosure  agreements  with its  employees  and
consultants,  and license agreements with customers,  which contain restrictions
on  disclosure,  use and transfer of  proprietary  information,  there can be no
assurance  that  such  arrangements   will  adequately   protect  the  Company's
proprietary  rights or that the  Company's  proprietary  rights  will not become
known to third  parties  in such a manner  that  the  Company  has no  practical
recourse.

           Risk of System  Failure  or  Inadequacy.  The  Company  operates  and
maintains  internal computers and  telecommunication  equipment for, among other
things,  monitoring and supporting its products and services,  and operating its
Real-Time  Roaming  Fraud  Prevention  Service.  The  Company's  operations  are
dependent  upon its ability to maintain such  equipment and systems in effective
working order and to protect them against  damage from fire,  natural  disaster,
power loss,  telecommunications  failure or similar events. Although the Company
provides back-up for substantially  all of its systems,  these measures will not
eliminate  the  risk to the  Company's  operations  from a  system  failure.  In
addition to its own systems,  the Company relies on certain  equipment,  systems
and services from third parties that are also subject to risks,  including risks
of system failure. There can


                                      -11-

<PAGE>



be no assurance that the Company's property and business interruption  insurance
will be adequate to compensate  the Company for any losses that may occur in the
event  of  a  system  failure.   Any  damage,   failure  or  delay  that  causes
interruptions  in the Company's  operations could have a material adverse effect
on the Company's business,  financial condition and results of operations. See "
- -- Dependence on Third Party Vendors."

           Government  Regulation and Legal  Uncertainties.  While, for the most
part, the Company's operations are not directly regulated, the wireless carriers
that  constitute  the  Company's  customers  are heavily  regulated  at both the
federal and state levels. Such regulation may inhibit the growth of the wireless
telecommunications  industry,  limit the number of potential  customers  for the
Company's  services  and  impede  the  Company's  ability  to offer  competitive
services to the  wireless  communications  market or  otherwise  have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.  At the same time, recently enacted federal legislation deregulating
the  telecommunications  industry may cause changes in the  industry,  including
entrance  of new  competitors  or  industry  consolidation,  which could in turn
subject the Company to increased pricing pressures,  decrease the demand for the
Company's  services,  increase the Company's cost of doing business or otherwise
have a material adverse effect on the Company's  business,  financial  condition
and results of  operations.  Additionally,  media  reports and certain  interest
groups  have  suggested  that  certain  RF  emissions  from  portable   cellular
telephones might be linked to various health concerns, including cancer, and may
cause  interference  with hearing aids,  pacemakers  and other medical  devices.
Concerns  over RF  emissions  may have the  effect  of  discouraging  the use of
cellular and other wireless  communications  services,  such as PCS, which could
have an adverse effect upon the Company's  business.  In addition,  the Personal
Communications   Industry  Association  announced  in  July  1995  that  it  was
undertaking  an  industry-wide  study to  gather  information  on  possible  PCS
interference  with  medical  devices  for all  PCS  protocols.  There  can be no
assurance  that such  reports  and the  findings  of such  study will not have a
material  adverse  effect on the  Company's  business,  financial  condition and
results  of  operations  or that  such  findings  will  not  lead to  government
regulation that will have a material  adverse effect on the Company's  business,
financial condition and results of operations.

           No Dividends.  To date, the Company has not paid any dividends on the
Common Stock and does not expect to declare or pay any  dividends on such Common
Stock in the foreseeable future.

           Outstanding  Options.  As of January 23, 1997, there were outstanding
stock options to purchase an aggregate of 2,378,020  shares of Common Stock at a
weighted average exercise price of approximately  $7.12 per share. To the extent
that these  outstanding  stock options are exercised,  dilution to the Company's
stockholders  may occur if the market price or book value of the Common Stock of
the Company at the time of exercise is greater  than the  exercise  price of the
options.  Moreover,  the terms  upon  which the  Company  will be able to obtain
additional  equity  capital may be adversely  affected since the holders of such
outstanding  securities  can be  expected  to  exercise  them at a time when the
Company would, in all likelihood,  be able to obtain any needed capital on terms
more favorable to the Company than those provided in the outstanding options.

           Shares  Eligible for Future Sale. As of the date of this  Prospectus,
the Company has outstanding  22,638,468 shares of Common Stock (including 29,960
shares  issued for option  exercises,  from  October 1, 1996 to the date of this
Prospectus),  of which the 400,000  shares to be resold in this offering and the
4,600,000  shares sold in the Company's  initial public  offering in August 1991
and all other shares will be freely  tradeable  without  restriction  or further
registration  under  the  Securities  Act,  except  for  those  shares  held  by
"affiliates"  (as defined in the  Securities  Act) of the Company.  There are no
restricted  shares  currently  outstanding.  Affiliates  are able to sell shares
pursuant  to Rule  144  ("Rule  144")  under  the  Securities  Act,  subject  to
compliance  with  certain  requirements  set  forth in Rule  144.  In  addition,
5,400,000  shares  of Common  Stock are  authorized  under  the  Company's  1991
Qualified Stock Option Plan, as amended,  1991 Non-Qualified  Stock Option Plan,
as amended,  1993 Non-Employee  Director Stock Option Plan and 1996 Stock Option
Plan. Of these shares, 1,988,020 shares


                                      -12-

<PAGE>



are  issuable  upon the exercise of  outstanding  stock  options  granted by the
Company, of which options to purchase 768,236 shares are currently  exercisable.
Registration  Statements  on Form  S-8  have  been  filed  with  the  Commission
registering  all of the shares of Common  Stock that may be issued  under  these
plans as well as the 390,000  shares of Common Stock subject to options  granted
to Robert  Dahut  which  were not  granted  under any stock  option  plan of the
Company of which options to purchase 30,000 shares are currently exercisable. No
new options will be granted under either the Company's 1991 Non-Qualified  Stock
Option Plan, or under the Company's 1991 Qualified  Stock Option Plan.  Sales of
substantial  amounts  of shares of Common  Stock in the  public  market,  or the
availability of such shares for future sale,  could adversely  affect the market
price of the Common Stock and could impair the Company's future ability to raise
additional capital through an offering of its equity securities.

           Possible  Volatility  of Stock Price.  The market price of the Common
Stock could be subject to significant  fluctuations in response to variations in
financial  results or  announcements  of  material  events by the Company or its
competitors.  Regulatory  changes  or changes in the  general  condition  of the
economy or the financial markets could also adversely affect the market price of
the Common Stock.

           Anti-Takeover  Provisions.   The  Certificate  of  Incorporation  and
By-laws of the Company contain various  provisions  which may have the effect of
discouraging,  delaying  or  preventing  future  changes of control or  takeover
attempts,  which  the  Company's  stockholders  may  deem  to be in  their  best
interests,  and  perpetuating  the Company's  existing  management.  Among other
things,  such  provisions:  (i)  provide  the  Board  of  Directors  with  broad
discretion to issue serial  preferred  stock;  (ii) provide for three-year terms
for the  directors  of the  Company  and the  election  of such  directors  on a
staggered  basis;  (iii) prohibit  repurchases by the Company from a stockholder
owning  5% or  more  or  the  Company's  voting  securities  (other  than  those
stockholders  meeting such  description  as of May 30, 1991) who have held their
securities  for less  than two  years,  unless  approved  by a  majority  of the
disinterested  stockholders;  and (iv) require the approval of two-thirds of all
shares  eligible  to vote  for any  proposed  amendment  to the  Certificate  of
Incorporation   or  By-laws  that  seeks  to  modify  or  remove  the  foregoing
provisions.  In addition,  in certain  circumstances,  Delaware law requires the
approval of  two-thirds  of all shares  eligible  to vote for  certain  business
combinations  involving a stockholder owning 15% or more of the Company's voting
securities  (other  than  stockholders   currently  meeting  such  description),
excluding the voting power held by such stockholder. The existence of all of the
above provisions may have the effect of  discouraging,  delaying or preventing a
future change of control or takeover attempt of the Company, which could have an
adverse effect on the market price of the Common Stock.




                                      -13-

<PAGE>



                            DESCRIPTION OF SECURITIES

           The following  summary  description of the Company's capital stock is
qualified  in  its  entirety  by  reference  to  the  Company's  Certificate  of
Incorporation.

Common Stock

           The Company is authorized to issue up to 30,000,000  shares of Common
Stock,  par value  $.001 per share.  As of January  21,  1997,  the  Company had
approximately  200  shareholders  of record and the Company  believes its Common
Stock is beneficially owned by in excess of 5,000 holders.

           Holders of Common  Stock are entitled to one vote for each share held
of  record  on each  matter  submitted  to a vote of  shareholders.  There is no
cumulative voting for election of directors.  Subject to the prior rights of any
series of preferred  stock which may from time to time be  outstanding,  if any,
holders of Common Stock are entitled to receive ratably  dividends when, as, and
if declared by the Board of Directors out of funds legally  available  therefore
and,  upon the  liquidation,  dissolution  or  winding  up of the  Company,  are
entitled to share ratably in all assets  remaining  after payment of liabilities
and payment of accrued  dividends and  liquidation  preferences on the preferred
stock,  if any.  Holders of Common Stock have no  preemptive  rights and have no
rights to convert their Common Stock into any other securities.  The outstanding
Common Stock is, and the Common Stock to be outstanding  upon completion of this
Offering  will  be,  duly  authorized  and  validly   issued,   fully  paid  and
nonassessable.

Preferred Stock

           The  Company  is  authorized  to  issue  up to  5,000,000  shares  of
preferred  stock, par value $.01 per share. The preferred stock may be issued in
one or more series, the terms of which may be determined at the time of issuance
by the Board of  Directors,  without  further  action by  shareholders,  and may
include  voting  rights  (including  the right to vote as a series on particular
matters), preferences as to dividends and liquidation, conversion and redemption
rights and sinking fund provisions.

           No shares of preferred stock will be outstanding as of the closing of
this  offering,  and the Company has no present plans for the issuance  thereof.
The issuance of any such preferred  stock could  adversely  affect the rights of
the holders of Common Stock and therefore, reduce the value of the Common Stock.
The ability of the Board of Directors to issue preferred stock could discourage,
delay or prevent a takeover to the Company.  See "Risk Factors --  Anti-Takeover
Provisions."

Anti-Takeover Provisions

           The Certificate of  Incorporation  and By-laws of the Company contain
various  provisions  which may have the  effect  of  discouraging,  delaying  or
preventing future changes of control or takeover  attempts,  which the Company's
stockholders  may deem to be in  their  best  interests,  and  perpetuating  the
Company's existing management.  Among other things, such provisions: (i) provide
the Board of Directors with broad  discretion to issue serial  preferred  stock;
(ii)  provide  for  three-year  terms for the  directors  of the Company and the
election of such directors on a staggered basis;  (iii) prohibit  repurchases by
the  Company  from a  stockholder  owning  5% or  more or the  Company's  voting
securities (other than those stockholders meeting such description as of May 30,
1991) who have held their securities for less than two years, unless approved by
a majority of the disinterested  stockholders;  and (iv) require the approval of
two-thirds  of all shares  eligible to vote for any  proposed  amendment  to the
Certificate  of  Incorporation  or  By-laws  that  seeks to modify or remove the
foregoing


                                      -14-

<PAGE>



provisions.  In addition,  in certain  circumstances,  Delaware law requires the
approval of  two-thirds  of all shares  eligible  to vote for  certain  business
combinations  involving a stockholder owning 15% or more of the Company's voting
securities  (other  than  stockholders   currently  meeting  such  description),
excluding the voting power held by such stockholder. The existence of all of the
above provisions may have the effect of  discouraging,  delaying or preventing a
future change of control or takeover attempt of the Company, which could have an
adverse effect on the market price of the Common Stock.

Election of Directors

           The Certificate of  Incorporation  and By-laws of the Company set the
number of  directors  at a minimum of three and a maximum of fifteen and provide
for three-year terms of office on a staggered basis.

Removal of Directors

           The Certificate of Incorporation of the Company permits  stockholders
to remove a director with or without cause by an affirmative  vote of two-thirds
of the total votes  eligible  to be cast at a duly  constituted  meeting  called
expressly for that purpose.

Approval of Repurchases

           The Certificate of Incorporation of the Company prohibits repurchases
by the Company from a shareholder  owning more than 5% of the  Company's  voting
securities (a "Significant  Shareholder") (other than those shareholders meeting
such  description  as of May 30,  1991) who has  owned  such  securities  of the
Company for less than two years,  unless  approved by an affirmative  vote of at
least a majority of the total votes  entitled to vote  generally in the election
of directors other than the voting power held by the Significant Shareholders.

Amendment of Certificate of Incorporation and By-Laws

           The  Certificate  of  Incorporation  provides that in addition to the
general  requirements  to amend a certificate of  incorporation,  an affirmative
vote of the holders of at least  two-thirds  of the total  votes  eligible to be
cast is required to amend the anti-takeover provisions described above.

           The Certificate of  Incorporation of the Company provides that either
the Board of  Directors  or the  stockholders  may  alter,  amend or repeal  the
By-laws  of the  Company.  The Board of  Directors  may take  such  action by an
affirmative vote of at least a majority of the directors at a meeting  expressly
called for that purpose.  Such action by  stockholders  requires an  affirmative
vote of at least  two-thirds of the total votes eligible to be cast at a meeting
called expressly for that purpose.

Transfer Agent

           Continental  Stock  Transfer & Trust  Company,  New York, New York as
Transfer Agent for the Common Stock.




                                      -15-

<PAGE>



                              SELLING SHAREHOLDERS

           The following table sets forth  information,  as of January 23, 1997,
with  respect to (i) each  Selling  Shareholder's  beneficial  ownership  of the
Company's  Common  Stock  prior to the  offering  of any shares of Common  Stock
hereunder  by such  Selling  Stockholders,  (ii) the  number of shares of Common
Stock which may be offered for sale  hereunder and (iii) the number of shares of
Common Stock to be  beneficially  owned by each Selling  Shareholders  after the
offering  (assuming  the  sale of all  shares  of  Common  Stock  being  offered
hereunder).  The Company will not receive any of the  proceeds  from the sale of
such securities. There are no material relationships between any of such Selling
Shareholders  and the  Company  or any of its  predecessors,  nor  have any such
material relationships existed within the past three years.

<TABLE>
<CAPTION>
                                 Shares of             Shares of              Shares of
                               Common Stock             Common              Common Stock
Name of Selling             Beneficially Owned        Stock to be        Beneficially Owned
 Stockholders                Prior to Offering     Offered Hereunder       After Offering
                                                                            
<S>                              <C>                     <C>                  <C>    
Harvey Sandler                   982,616                 120,000              862,616
Phyllis Sandler                  122,000(1)               60,000               62,000
Fusion Partners, L.P.             65,000                  65,000                    0
Fusion Offshore Fund Ltd.          1,300                   1,300                    0
Ricky Sandler                      3,700                   3,700                    0
Andrew Sandler                    10,000                  10,000                    0
Martin Tash                      120,000(2)              120,000                    0(2)
Jeffrey M. Levine                 20,700(3)               10,000               10,700
David Ross                        11,200(4)               10,000                1,200(4)
</TABLE>

- ---------------------
(1)   Includes 1,000 shares of Common Stock in an IRA Account,
(2)   Additional  shares of Common  Stock in which  Martin Tash may be deemed to
      have an interest  include (i) Martin and Arlene S. Tash,  Joint  Account -
      90,500  shares;  (ii) Arlene S. Tash - 6,622  shares;  and (iii) Arlene S.
      Tash, IRA - 10,778 shares.  Arlene S. Tash is the wife of Martin Tash. (3)
      Includes  5,156  shares of Common  Stock in an IRA  Account.  (4) Includes
      1,200 shares of Common Stock in an IRA  Account.  Does not include  18,002
      shares of Common Stock held by Amy Ross (the wife of David Ross).


                                      -16-

<PAGE>



                              PLAN OF DISTRIBUTION


           The  shares of Common  Stock may be offered  for sale by the  Selling
Shareholders  from time to time in the  over-the-counter  market,  in  privately
negotiated  transactions or otherwise at market prices prevailing at the time of
sale,  at prices  relating to such  prevailing  market  prices or at  negotiated
prices.  The shares of Common Stock may be sold by one or more of the  following
methods:  (a) ordinary  brokerage  transactions  and  transactions  in which the
broker  solicits  purchasers;  (b) purchases by a broker or dealer as principal,
and the  resale by such  broker  or  dealer  for its  account  pursuant  to this
Prospectus,  including resale to another broker or dealer;  (c) a block trade in
which the broker or dealer so engaged  will attempt to sell the shares of Common
Stock as agent but may  position  and resell a portion of the block as principal
in order to facilitate the transaction;  or (d) negotiated  transactions between
one or more Selling  Shareholders and purchasers  without a broker or dealer. In
connection  with  any  sales,  a  Selling  Shareholders  and  broker  or  dealer
participating in such sales may be deemed  "underwriters"  within the meaning of
the Securities Act.

           Brokers  or  dealers   selling  under  this  Prospectus  may  receive
discounts,  commissions  or  concessions  from  a  Selling  Shareholders  and/or
purchasers  of the Shares for whom such broker or dealers may act as agents,  or
to  whom  they  may  sell as  principal,  or both  (which  compensation  as to a
particular broker or dealer may be in excess of customary commissions). Any such
discounts,  commissions and concessions and any profits  realized on the sale of
Shares may be deemed to be underwriting  compensation  under the Securities Act.
Certain  of the  Selling  Shareholders  may,  under  certain  circumstances,  be
entitled  to  indemnification  against  liabilities  under  the  Securities  Act
pursuant to agreements between them and the Company.

           At such  time as Rule  144  becomes  available  for the  sale of such
shares of Common Stock,  such shares may be sold under Rule 144 instead of under
this Prospectus,  subject to compliance with the volume limitations,  as well as
the other requirements of Rule 144.

           The Selling  Shareholders  have been  advised by the Company that (i)
they are subject to the prospectus  delivery  requirements  under the Securities
Act with respect to any sale of shares pursuant to this  Prospectus;  (ii) that,
to the extent deemed  "distributing"  Common Stock, neither they nor any brokers
or  dealers  acting  for them  nor any  "affiliated  purchasers"  may bid for or
purchase  any  Common  Stock of the  Company  or attempt to induce any person to
purchase  any Common  Stock in  violation  of Rule 10b-6  promulgated  under the
Exchange  Act or (iii)  they may not  engage in any  stabilization  activity  in
connection with the Common Stock.

                                  LEGAL MATTERS

           The validity of the Common Stock offered  hereby has been passed upon
for the Company by Parker Chapin Flattau & Klimpl, LLP, New York, New York.

                                     EXPERTS

           The financial  statements  of the Company  appearing in the Company's
Annual  Report  (Form  10-K) for the year ended  December  31,  1995,  have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
thereon  incorporated by reference therein and incorporated herein by reference.
Such financial  statements are incorporated herein by reference in reliance upon
such report given upon the authority of such firm as experts in  accounting  and
auditing.



                                      -17-

<PAGE>

======================================   =======================================
      No person has been authorized in
connection   with  the  offering  made
hereby to give any  information  or to
make any  representation not contained
in this  Prospectus or a supplement to
this  Prospectus,  and,  if  given  or
made,     such      information     or
representation must not be relied upon              CELLULAR TECHNICAL    
as  having  been   authorized  by  the            SERVICES COMPANY, INC.  
Company,  the Selling  Shareholders or                                    
any   other   person.   Neither   this                                    
Prospectus  nor any supplement to this                                    
Prospectus  constitutes  an  offer  to                                    
sell or a solicitation  of an offer to               400,000 Shares of    
buy,  any  securities  other  than the                 Common Stock       
securities  to which it  relates or an                                    
offer to sell or the  solicitation  of                                    
an offer to buy such securities in any                                    
jurisdiction  where,  or to any person                                    
to whom it is unlawful to make such an                                    
offer  or  solicitation.  Neither  the                                    
delivery  of this  Prospectus  nor any           _________________________
supplement to this  Prospectus nor any                                    
sale  made   hereunder  or  thereunder                  PROSPECTUS        
shall, under any circumstances, create           _________________________
any implication that there has been no                                    
change in the  affairs of the  Company                                    
since the date  hereof or  thereof  or                                    
that the information  contained herein                                    
is correct  as of any time  subsequent                                    
to  the   dates  as  of   which   such                                    
information is furnished.                                                 
                                                                          
         ---------------------                                            
           TABLE OF CONTENTS      
                                  Page                                    
                                      
Available Information.............  2
Information Incorporated by
  Reference.......................  2
The Company.......................  3
Recent Developments...............  4
Special Note Regarding 
 Forward-Looking Statements.......  5
Risk Factors......................  6
Description of Securities......... 14
Selling Shareholders.............. 16
Plan of Distribution.............. 17
Legal Matters..................... 17
Experts........................... 17

         ---------------------



                                                                , 1997

======================================   =======================================


<PAGE>



                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.   OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

           All of the  expenses  listed below are  estimated  except for the SEC
registration  fee.  The  itemized  statement  below  includes  all  expenses  in
connection with the distribution of the securities being registered,  other than
underwriting discounts and commissions:


Securities and Exchange Commission registration fee................$  2,068.18
Blue Sky fees and expenses                                            2,500.00
Printing and engraving expenses....................................   2,500.00
Accounting fees and expenses.......................................   5,000.00
Legal fees and expenses............................................  25,000.00
Miscellaneous expenses.............................................     931.82
                                                                   -----------
           TOTAL...................................................$ 38,000.00
                                                                   ===========


ITEM 15.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

           The Company is incorporated  under the laws of the State of Delaware.
Section 145 of the General  Corporation  Law of the State of Delaware  ("Section
145") provides that a Delaware corporation may indemnify any persons who are, or
are  threatened  to be made,  parties to any  threatened,  pending or  completed
action,  suit  or  proceeding,   whether  civil,  criminal,   administrative  or
investigative (other than an action by or in the right of such corporation),  by
reason of the fact that such person was a director,  officer,  employee or agent
of such corporation,  or is or was serving at the request of such corporation as
a  director,  officer,  employee or agent of another  corporation,  partnership,
joint venture,  trust or other  enterprise.  The indemnity may include  expenses
(including  attorneys'  fees),  judgments,  fines and amounts paid in settlement
actually and reasonably  incurred by such person in connection with such action,
suit or proceeding,  provided such person acted in good faith and in a manner he
reasonably  believed to be in or not opposed to the corporation's best interests
and, with respect to any criminal action or proceeding,  had no reasonable cause
to believe that his conduct was unlawful.  A Delaware  corporation may indemnify
any persons who are, or are  threatened  to be made, a party to any  threatened,
pending or  completed  action or suit by or in the right of the  corporation  by
reason of the fact that such person was a director,  officer,  employee or agent
of another corporation,  partnership,  joint venture, trust or other enterprise.
The indemnity may include  expenses  (including  attorneys'  fees)  actually and
reasonably  incurred by such person in connection with the defense or settlement
of such action or suit, provided such person acted in good faith and in a manner
he  reasonably  believed  to be in or  not  opposed  to the  corporation's  best
interests except that no  indemnification is permitted without judicial approval
if the  director,  officer,  employee  or agent is  adjudged to be liable to the
corporation.  Where a director,  officer, employee or agent is successful on the
merits or  otherwise  in the  defense  of any  action  referred  to  above,  the
corporation  must  indemnify him against the expenses  which he has actually and
reasonably incurred.

           The  Company's   certificate  of   incorporation   provides  for  the
indemnification  of directors and officers of the Company to the fullest  extent
permitted by Section 145.




                                      II-1

<PAGE>



ITEM 16.   EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

           (a)       Exhibits:

          4.1   --    Specimen Certificate for Common Stock of Registrant(1)
          4.2   --    Stock Purchase Agreement dated as of November 8, 1996,
                      among the Company and the investors specified therein (2)
          5.1   --    Opinion of Parker Chapin Flattau & Klimpl, LLP(3)
         23.1   --    Consent of Ernst & Young LLP(3)
         23.2   --    Consent of Parker Chapin Flattau & Klimpl, LLP (included
                      in opinion filed as Exhibit 5.1)
- --------------------
      (1)   Incorporated  by  reference  to  Registration  Statement on Form S-1
            declared effective on August 6, 1991 (File No. 33-41176).
      (2)   Incorporated by reference to Quarterly  Report on Form 10-Q filed on
            November 14, 1996,  for the quarter  ended  September 30, 1996 (File
            No. O-19437).
      (3)   Filed herewith.

ITEM 17.   UNDERTAKINGS.

           Insofar  as  indemnification   for  liabilities   arising  under  the
Securities  Act of 1933 (the "Act") may be permitted to directors,  officers and
controlling persons of the registrant pursuant to the foregoing  provisions,  or
otherwise, the registrant has been advised that in the opinion of the Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for  indemnification  against  such  liabilities  (other than the payment by the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

           The undersigned registrant hereby undertakes:

           (1) To file,  during  any  period in which  offers of sales are being
made, a post-effective amendment to this Registration Statement:

                      (i) To include any prospectus required by Section 10(a)(3)
of the Securities Act of 1933;

                      (ii) To  reflect  in the  prospectus  any  facts or events
arising  after the  effective  date of the  Registration  Statement (or the most
recent post-effective amendment thereof) which, individually or in
the aggregate,  represent a fundamental  change in the  information set forth in
the Registration Statement; and

                      (iii) To include any material  information with respect to
the plan of distribution  previously disclosed in the Registration  Statement or
any material change to such information in the Registration Statement;



                                      II-2

<PAGE>



provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished to the
Commission by the  Registrant  pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934 that are  incorporated  by  reference  in the  Registration
Statement.

           (2) That,  for the purpose of  determining  any  liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof; and

           (3)  to  remove  from  the  Registration  Statement  by  means  of  a
post-effective  amendment any of the securities  being  registered  which remain
unsold at the termination of the offering.

           The  undersigned  registrant  hereby  undertakes that for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Securities  Exchange  Act of 1934  that is  incorporated  by  reference  in this
Registration  Statement  shall  be  deemed  to be a new  registration  statement
relating to the securities  offered herein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.






                                      II-3

<PAGE>



                                   SIGNATURES

           Pursuant  to the  requirements  of the  Securities  Act of 1933,  the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the  City of New  York,  State of New  York,  on the 27th day of
January 1997.

                                   CELLULAR TECHNICAL SERVICES COMPANY, INC.


                                   By:  /s/ Stephen Katz
                                      --------------------------------------
                                      Stephen Katz, Chairman of the
                                      Board of Directors and Chief Executive
                                      Officer

           The undersigned directors and officers of Cellular Technical Services
Company,  Inc.  hereby  constitute  and appoint  Stephen Katz with full power of
substitution and resubstitution,  our true and lawful attorney-in-fact with full
power to execute in our name and behalf in the  capacities  indicated  below any
and all amendments (including  post-effective amendments and amendments thereto)
to this  registration  statement and to file the same, with all exhibits thereto
and other  documents in connection  therewith  with the  Securities and Exchange
Commission  and hereby ratify and confirm that such  attorney-in-fact,  or their
substitutes shall lawfully do or cause to be done by virtue thereof.

           Pursuant to the  requirements  of the  Securities  Act of 1933,  this
amendment to the Registration Statement has been signed by the following persons
in the capacities and on the 27th day of January 1997.


       Signature               Title                                 Date

/s/ Stephen Katz          Chairman of the Board of Directors    January 27, 1997
- ------------------------  and Chief Executive Officer
Stephen Katz       

/s/ Robert P. Dahut       Director, President and Chief         January 27, 1997
- ------------------------  Operating Officer
Robert P. Dahut     

/s/ Michael E. McConnell  Vice President and Chief Financial    January 27, 1997
- ------------------------  Officer (Principal Financial and
Michael E. McConnell      Accounting Officer)
                          

/s/ Jay Goldberg          Director                              January 27, 1997
- ------------------------  
Jay Goldberg


/s/ Lawrence Schoenberg   Director                              January 27, 1997
- ------------------------  
Lawrence Schoenberg



                                      II-4

<PAGE>



                                  EXHIBIT INDEX

       4.1     --    Specimen Certificate for Common Stock of Registrant(1)
       4.2     --    Stock Purchase Agreement dated as of November 8, 1996, 
                     among the Company and the investors specified therein (2)
       5.1     --    Opinion of Parker Chapin Flattau & Klimpl, LLP(3)
      23.1     --    Consent of Ernst & Young LLP(3)
      23.2     --    Consent of Parker Chapin Flattau & Klimpl, LLP (included
                     in opinion filed as Exhibit 5.1)
- ----------------------
      (1)   Incorporated  by  reference  to  Registration  Statement on Form S-1
            declared effective on August 6, 1991 (File No. 33-41176).
      (2)   Incorporated by reference to Quarterly  Report on Form 10-Q filed on
            November 14, 1996,  for the quarter  ended  September 30, 1996 (File
            No. O-19437).
      (3)   Filed herewith.






                     [PARKER CHAPIN FLATTAU & KLIMPL, LLP]
                                   Letterhead



                                January 27, 1997



Cellular Technical Services Company, Inc.
2401 Fourth Avenue
Seattle, Washington 98121

           Re:        Cellular Technical Services Company, Inc.

Gentlemen:

           We have acted as counsel to Cellular Technical Services Company, Inc.
(the  "Company") in connection  with its filing of a  registration  statement on
Form S-3 (the "Registration  Statement")  covering 400,000 outstanding shares of
Common Stock (the "Shares"),  as more particularly described in the Registration
Statement.

           In our  capacity  as counsel to the  Company,  we have  examined  the
Registration Statement,  the Company's Certificate of Incorporation and By-laws,
as amended to date,  and the  minutes  and other  corporate  proceedings  of the
Company.

           With respect to factual  matters,  we have relied upon statements and
certificates  of  officers  of the  Company.  We have also  reviewed  such other
matters of law and  examined and relied upon such other  documents,  records and
certificates as we have deemed relevant hereto. In all such examinations we have
assumed conformity with the original documents of all documents  submitted to us
as  conformed  or  photostatic  copies,  the  authenticity  of all  documents as
originals and the  genuineness of all  signatures on all documents  submitted to
us.

           On the basis of the foregoing,  we are of the opinion that the Shares
have  been  validly  authorized  and  legally  issued  and are  fully  paid  and
non-assessable.




<PAGE>


Cellular Technical Services Company, Inc.
January 27, 1997
Page 2

           We hereby  consent  to the use of our name under the  caption  "Legal
Opinions" in the prospectus  constituting a part of the  Registration  Statement
and to the filing of a copy of this opinion as an Exhibit thereto.


                                         Very truly yours,

                                         /s/ PARKER CHAPIN FLATTAU & KLIMPL, LLP

                                         PARKER CHAPIN FLATTAU & KLIMPL, LLP






                         Consent of Independent Auditors

           We consent to the  reference to our firm under the caption  "Experts"
in the  Registration  Statement  (Form S-3) and related  Prospectus  of Cellular
Technical  Services Company,  Inc. for the registration of 400,000 shares of its
common stock and to the  incorporation by reference  therein of our report dated
March 1, 1996,  with  respect  to the  financial  statements  and  schedules  of
Cellular  Technical  Services Company,  Inc. included in its Annual Report (Form
10-K) for the year  ended  December  31,  1995,  filed with the  Securities  and
Exchange Commission.

/s/ ERNST & YOUNG LLP

Seattle, Washington
January 24, 1997



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