Exhibit 31.1

Rule 13a-14(a) Certification



| | 1. |  | I have reviewed this quarterly report of Cellular Technical Services Company, Inc.;                                                                                                                                                                                                                                                
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| | 2. |  | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;                         
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| | 3. |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the small business issuer as of, and for, the periods presented in this report;                                 
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| | 4. |  | The small business issuer's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the small business issuer and have:                                                                               
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| | 5. |  | The small business issuer's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the small business issuer's auditors and the audit committee of the small business issuer's board of directors (or persons performing the equivalent functions):
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| | By: | /s/Kenneth Block                     
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| |     | Kenneth Block                        
| |     | Secretary and Chief Financial Officer
| |     | April 20, 2007                       



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