1.3 Additional shares due to SoftBank. If the T-Mobile VWAP is at any time during the period beginning on the second (second) anniversary of the closing date and ends on the end date, an amount equal to or greater than the threshold price (this condition, the “additional issuance condition”), then T-Mobile, subject to the other provisions of this section 1.3, has without delay and in all cases within ten (10) working days following the delivery of the documents, which are reasonably required by the transfer agent for T-Mobile`s common stock, issued to SoftBank or, at SoftBank`s written request, T-Mobile US, Inc. (“T-Mobile”) filed a registration statement on Form S-4 (File 333-226435), which was declared effective on October 29 by the U.S. Securities and Exchange Commission (the “SEC”). , 2018, which contains a joint approval statement from T-Mobile and Sprint Corporation (“Sprint”), which also constitutes a prospectus of T-Mobile (the “common approval statement/prospectus”), and each party will file additional documents on the proposed transaction with the SEC. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE JOINT SOLICITATION SOLICITATION STATEMENT/OTHER relevant for www.t-mobile.com or ON the SEC website, for www.sec.gov or for T-Mobile, contact T-Mobile US, Inc., Investor Relations, 1 Park Avenue, 14th Floor, New York, NY 10016 or by phone at 212-358-3210. Documents provided by Sprint can be sent free of charge to Sprint`s website, for www.sprint.com or on the SEC website, for www.sec.gov or sprint at Sprint Corporation, Shareholder Relations, 6200 Sprint Parkway, E-mail KSOPHF0302-3B679, Overland Park, Kansas 66251 or by phone at 913-794-1091. “mail-order arrangement,” the correspondence agreement between DT, SoftBank and the Company, dated February 20, 2020. As a non-carrier U.S. company, T-Mobile US, Inc. (NASDAQ: TMUS) defines how consumers and businesses purchase wireless services through innovations in advanced products and services. Our advanced national 4G-LTE network offers 86.0 million customers who are not willing to compromise on quality and value, excellent Wi-Fi experiences. T-Mobile US, based in Bellevue, Washington, offers services through its subsidiaries and operates its flagship brands T-Mobile and Metro by T-Mobile.

For more information, see www.t-mobile.com. 1.4 Softbank Voting Notification. If the deadline is May 1, 2020 or later, SoftBank T-Mobile and DT are no later than the reference date (provided that: if the deadline cannot be reached before June 1, 2020, the SoftBank voting notice will be notified by June 1, 2020, will choose the terms (but not the combination) of the following clause (a) or the following clause (b): at the same time as the entry into the amendment, T-Mobile, SoftBank and Deutsche Telekom have entered into a correspondence agreement (the “correspondence contract”).