**Exhibit 31.1**

**CERTIFICATION**

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

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

2.          Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

3.          Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respectsthe financial condition, results of operations and cash flows of the registrantas of, and for, the periods presented in this report;

4.          The registrant’s other certifying officer(s) and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15e and 15d-15e) and internal control overfinancial reporting (as defined in Exchange Act Rules 13a-15f and 15d-15f)for the registrant and have:

a.          Designed suchdisclosure 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 consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;

b.         Designed suchinternal control over financial reporting, or caused such internal control overfinancial reporting to be designed under our supervision, to provide reasonableassurance regarding the reliability of financing reporting and the preparationof financial statements for external purposes in accordance with generallyaccepted accounting principles.

c.          Evaluated theeffectiveness 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.         Disclosed in thisreport any change in the registrant’s internal control over financial reportingthat occurred during the registrant’s most recent fiscal quarter (the registrant’sfourth 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 other certifying officer(s) and I have disclosed, basedon our most recent evaluation of internal control over financial reporting, tothe registrant’s auditors and the audit committee of registrant’s board ofdirectors (or persons performing 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: November 9, 2006

 
| /s/ HENRY H. GRAHAM, JR.   |   |   |
|----------------------------|--------|--------|
| Henry H.  Graham, Jr. |   |   |
| Chief Executive  Officer   |   |   |

 

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