GTT Communications (GTTNQ) 10-Q 2008 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION OF
CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Global Telecom & Technology, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Richard D. Calder, Jr., Chairman of the Board, Executive Chairman and Chief Executive Officer of the Company certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my best knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Date: November 13, 2008	/s/ Richard D. Calder, Jr.
	Richard D. Calder, Jr.
	President, Chief Executive Officer and Interim Chief Financial Officer