As previously disclosed, Thomas Dannenfeldt, a member of the board of directors of T-Mobile US, Inc., notified the Company of his decision to resign from the Board effective December 1, 2018. On November 30, 2018, the Board elected Dr. Christian P. Illek to fill the vacancy, contingent and effective upon Mr. Dannenfeldt’s resignation. Dr. Illek will also succeed Mr. Dannenfeldt on the Compensation Committee, Executive Committee and Transaction Committee of the Board. Dr. Illek was designated for nomination by Deutsche Telekom AG, pursuant to Deutsche Telekom’s rights under the Company’s certificate of incorporation and the Stockholder’s Agreement by and between Deutsche Telekom and the Company, dated as of April 30, 2013. Dr. Illek currently serves on the board of management of Deutsche Telekom as the Board Member for Human Resources and has been appointed to serve as the Chief Financial Officer of Deutsche Telekom effective January 2019.