Exhibit 23.3



               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

We have issued our report dated February 19, 1998, accompanying the consolidated
financial statements of Phoenix Network Inc. and subsidiaries as of December 31,
1996 and 1997, and for each of the three years in the period ended December 31,
1997, appearing in the Registration Statement. We hereby consent to the use of
our report on the aforementioned consolidated financial statements in the
Registration Statement and to the use of our name as it appears under the
caption "Experts."

GRANT THORNTON LLP

Denver, Colorado
March 19, 1999