**Exhibit 31.1**

**CERTIFICATION**

I, Henry H.Graham, Jr., certify that:

1.             I have reviewed thisquarterly report on Form 10-Q of TNS, Inc.;

2.             Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this report;

3.             Based on my knowledge, thefinancial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periodspresented in this report;

4.             The registrant’s othercertifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange ActRules 13a-15e and 15d-15e) and internal control over financial reporting(as defined in Exchange Act Rules 13a-15f and 15d-15f) for the registrantand have:

a.             Designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidated subsidiaries,is made known to us by others within those entities, particularly during theperiod in which this report is being prepared;

b.             Designedsuch internal control over financial reporting, or caused such internal controlover financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financing reporting and thepreparation of financial statements for external purposes in accordance withgenerally accepted accounting principles.

c.             Evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

d.             Disclosedin this report any change in the registrant’s internal control over financialreporting that occurred during the registrant’s most recent fiscal quarter (theregistrant’s fourth fiscal quarter in the case of an annual report) that has materiallyaffected, or is reasonable likely to materially affect, the registrant’sinternal control over financial reporting; and

5.             The registrant’s othercertifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of registrant’s board of directors (or personsperforming the equivalent functions):

a.             Allsignificant deficiencies and material weaknesses in the design or operation ofinternal controls over financial reporting which are reasonable likely toadversely affect the registrant’s ability to record, process, summarize andreport financial information; and

b.             Anyfraud, whether or not material, that involves management or other employees whohave a significant role in the registrant’s internal control over financialreporting.

DATE: August 9,2007
| /s/ HENRY H. GRAHAM, JR.   |   |   |
|----------------------------|--------|--------|
| Henry H.  Graham, Jr. |   |   |
| Chief Executive  Officer   |   |   |

 

 

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