Exhibit 99.4 AGREEMENT TO BE BOUND BY DEUTSCHE TELEKOM STOCKHOLDER AGREEMENT AND SIDE LETTER AGREEMENT The undersigned, TDSI Corporation, being the transferee from Telephone and Data Systems, Inc. ("TDS") of 35,570,493 shares of the common stock, par...Letter Agreement • January 16th, 2001 • Telephone & Data Systems Inc /De/ • Telephone communications (no radiotelephone) • Delaware
The undersigned, TDSI Corporation, being the transferee from Telephone and Data Systems, Inc. ("TDS") of 35,570,493 shares of the common stock, par value $.001 per share, of VoiceStream Wireless Corporation, a Delaware corporation (the "Company"), as a condition to the receipt of such shares, acknowledges that matters pertaining to the voting, transfer and ownership of such shares is governed by the Stockholder Agreement dated as of July 23, 2000, between TDS and Deutsche Telekom AG ("DT") and the Side Letter Agreement dated as of July 23, 2000, between TDS and DT (collectively, the "Agreements"), and hereby (1) acknowledges receipt of a copy of the Agreements, and (2) agrees to be bound, to the same extent as TDS has heretofore been bound, by the terms of the Agreements, as the same have been or may be amended from time to time.
AGREEMENT TO BE BOUNDVoting Agreement • January 16th, 2001 • Telephone & Data Systems Inc /De/ • Telephone communications (no radiotelephone) • Delaware
The undersigned, TDSI Corporation, being the transferee from Telephone and Data Systems, Inc. ("TDS") of 35,570,493 shares of the common stock, par value $.001 per share, of VoiceStream Wireless Corporation, a Delaware corporation (the "Company"), as a condition to the receipt of such shares, acknowledges that matters pertaining to the voting of such shares is governed by the Voting Agreement among the Company and certain stockholders of the Company ("Company Stockholders"), as accepted by TDS on May 4, 2000, and as amended by the First Amended and Restated Voting Agreement dated as of July 23, 2000 among the Company, Company Stockholders, TDS and Deutsche Telekom, AG (collectively, the "Agreement"), and hereby (1) acknowledges receipt of a copy of the Agreement, and (2) agrees to be bound, to the same extent as TDS has heretofore been bound, by the terms of the Agreement, as the same has been or may be amended from time to time.
