Second Amendment to the Fifth Amended and Restated Limited Liability Company Agreement of Mobility II LLC

LIMITED LIABILITY COMPANY AGREEMENT (this “Amendment”) is entered into as of January 27, 2022 by AT&T Mobility Corporation, a Delaware corporation, as the manager (the “Manager”) of AT&T Mobility II LLC (the “Company”) pursuant to Paragraph 15 of the Existing Agreement (defined below).

WHEREAS, the Company is governed by the Fifth Amended and Restated Limited Liability Company Agreement of the Company, as amended by the First Amendment dated January 1, 2022 (the “Existing Agreement”); and

WHEREAS, the Manager desires to amend Schedule A of the Existing Agreement to (i) remove Harbor Bond Fund (the “Selling Member”) as a Member and (ii) to reflect the revised list of Series A Preferred Interest Members, and does hereby adopt this Amendment as an amendment to the Existing Agreement.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereby agree as follows:

1.Definitions. Capitalized terms used and not otherwise defined herein shall have the meanings given to such terms in the Existing Agreement.

2.Amendment. The Schedule to the Existing Agreement entitled, SCHEDULE A – MEMBERS shall be deleted in its entirety and replaced by SCHEDULE A – MEMBERS, attached hereto, which sets forth the current list of Series A Preferred Interest Members and the Percentage Interest of the Common Interest Members as of 12:01 a.m. Eastern time on January [27], 2022.

3.Full Force and Effect. Except as amended by this Amendment, the Existing Agreement shall continue in full force and effect.

4.Counterparts. This Amendment may be executed in one or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same agreement.