Exhibit 99.1   Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
               of 2002

In connection with the filing of the Quarterly Report on Form 10-Q for the
Quarter Ended September 30, 2002 (the "Report") by Cellular Technical Services
Company, Inc. ("Registrant"), each of the undersigned hereby certifies that:

     1.   The Report fully complies with the requirements of section 13(a) or
          15(d) of the Securities Exchange Act of 1934, as amended, and

     2.   The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of Registrant.

                  By: /s/ Stephen Katz
                      ----------------
                      Stephen Katz
                      Chief Executive Officer
                      November 8, 2002

                  By: /s/ Bruce R. York
                      -----------------
                      Bruce R. York
                      Vice President and Chief Financial Officer
                      November 8, 2002