Document:

EX-10.1

 Exhibit 10.1 

EXECUTIVE EMPLOYMENT AGREEMENT 

THIS Executive Employment Agreement (“Agreement”) is made and entered into as of March 15, 2017 (the “Effective
Date”), by and between Rubicon Technology, Inc., a Delaware corporation (the “Company”), and Timothy E. Brog, a resident of the State of Connecticut (the “Executive”). 

PRELIMINARY STATEMENTS 

The Company is in the business of providing material science solutions of sapphire and other advanced technology materials for the
Opto-electrics Semiconductor Fabrication, Optical and Laser and Telecommunications Marketplaces (“Company’s Business”); provided, however, the term shall be deemed amended to reflect any actual change in the
Company’s Business after the date hereof but prior to the day following the date on which Executive shall cease to be employed by the Company (as reflected in the minutes of the Board of Directors of the Company prior to the Termination Date
(as defined below) or the Resignation Date (as defined below), as applicable). However the term “Company’s Business” shall not include any legal, investment banking, money management or home manufacturing business or any business
related thereto that does not directly compete with the Company. 
 As a result of Executive’s role as a member of the Company’s
Board of Directors, the Executive is well acquainted with the affairs of the Company and its personnel, services, products, and business practices and relationships and other Confidential Information (as defined in
Section 5 below). This Agreement is entered into for, among other things, the protection of the Company’s business relationships, goodwill and going business value and the prevention of the unauthorized use or
disclosure of any Confidential Information by the Executive. 
 Capitalized terms used herein, but not otherwise defined shall have the
meanings ascribed to such terms in the Company’s 2016 Stock Incentive Plan, as amended (the “Plan”). 
 AGREEMENT

 In consideration of the premises and the mutual promises and covenants contained in this Agreement and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto agree as follows: 

Section 1.    Employment and Duties. 

(a)    Employment Duties. Throughout the Employment Term (as defined in
Section 2 below), the Executive shall serve as the President and Chief Executive Officer (“CEO”) of the Company, and shall report to the Board of Directors of the Company (the “Board”).
Throughout the Employment Term, the Executive shall: (i) devote his working hours, on a full-time basis, to his duties and responsibilities to the Company except as provided herein; (ii) faithfully and loyally serve the Company;
(iii) comply in all material respects with all lawful directions and instructions given to him by the Board; and (iv) 

 
use his best efforts to promote and serve the interests of the Company. The Executive shall comply in all material respects with all applicable laws, rules and regulations relating to the
performance of the Executive’s duties and responsibilities hereunder. 
 (b)    Exclusive
Employment. Throughout the Employment Term, the Executive shall not render his services, directly or indirectly, to any person or entity other than the Company without the prior consent of the Board, which may be withheld or granted by the Board
in its sole discretion. The Executive shall not engage in any activity which would materially interfere with the faithful and timely performance of his duties under this Agreement; provided, however, the Executive may, subject
to the prior consent of the Board, which shall not be unreasonably withheld, serve as a director of any other company, so long as such service does not unreasonably and materially interfere with the timely performance of the Executive’s duties
under this Agreement. The Board acknowledges that the Executive currently serves on the Board of Directors of Eco-Bat Technologies Ltd and consents to such service. 

Section 2.    Employment Term. The Executive’s employment as the
President and CEO of the Company shall commence on March 17, 2017 and shall continue thereafter unless and until his employment is terminated pursuant to the terms of this Agreement. As used herein, “Employment Term” shall mean
the actual period of time during which the Executive is employed by the Company under the terms and conditions of this Agreement. 

Section 3.    Compensation and Other Benefits. During the Employment Term, the
Company shall pay and provide the following compensation and other benefits to the Executive as full compensation for all services rendered by the Executive to the Company: 

(a)    Annual Salary. The Executive’s annual salary shall be Three Hundred and Six Thousand
Dollars ($306,000.00) (the “Annual Salary”). The Annual Salary shall be paid in accordance with the then-prevailing payroll practices of the Company, less applicable taxes, payroll deductions and withholdings required by law. The
Board shall review the Annual Salary on an annual basis and make appropriate adjustments thereto from time to time; provided that the Annual Salary shall not be reduced below $306,000 without the Executive’s prior written consent. At the end of
calendar year 2017, the Company agrees that the Board shall review the Annual Salary to make any appropriate adjustments, in its sole discretion, based on anticipated improvements in the Company’s cost structure and business outlook. 

(b)    Bonuses. 

(i)    In 2017, the Executive shall be eligible to receive a bonus of One Hundred Fifty Thousand Dollars
($150,000.00) based upon the achievement of certain objectives and criteria mutually agreed upon by the Board and the Executive (the “Cash Bonus”). The Board and the Executive shall agree upon the bonus objectives and criteria for
the Cash Bonus no later than March 31, 2017. The Cash Bonus, if achieved by the Executive, will be paid no later than March 31, 2018, and shall be subject to applicable taxes, payroll deductions, and withholdings required by law. For years
after 2017, the Board shall review the Executive’s eligibility for similar bonuses based upon the achievement of certain objectives and criteria mutually agreed upon by the Board and the Executive. 

  
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 (ii)    The Board, in its sole discretion, may determine to
pay Executive a discretionary cash bonus (the “Discretionary Bonus”). If paid, the Discretionary Bonus shall be subject to applicable taxes, payroll deductions, and withholdings required by law. 

(ii)    The Company shall pay to the Executive a signing cash payment in the amount of Twenty-five Thousand
Dollars ($25,000.00) on or before April 1, 2017. This payment shall be subject to applicable taxes, payroll deductions and withholdings as required by law. 

(iii)    All of the terms set forth in the Non-Employee Director
Restricted Stock Agreement, effective as of May 26, 2016 by and between the Company and the Executive and all other payments scheduled to be paid and agreed upon when the Executive joined the Board shall continue to be valid, enforceable and
are due and payable upon the terms thereof. 
 (c)    Equity and Incentive
Compensation.    Within five (5) business days after the date of this Agreement, the Company shall issue to Executive a total of 900,000 restricted stock units (“RSU’s) for shares of the Company’s common
stock, par value $.001 per share (the “Common Stock”), pursuant to the agreement attached hereto as Exhibit A, which shall vest in accordance with the schedule set forth below. In the event of any stock split, combination or similar
event, the number of RSU’s and shares of Common Stock referred to above and the Target Price (as defined below) shall be adjusted proportionately so that the number of RSU’s and shares of Common Stock and Target Price would be of
equivalent value.    Such RSU’s shall vest as follows: 
  

					
	 Number of RSU’s Vested
	  	Target Price	 
	 150,000
	  	$	0.65	 
	 150,000
	  	$	0.80	 
	 150,000
	  	$	0.95	 
	 150,000
	  	$	1.10	 
	 150,000
	  	$	1.25	 
	 150,000
	  	$	1.40	 

 The RSU’s shown on each row of the table above shall vest on the first date before the fourth anniversary
of the date hereof, if any, that the average closing price of the Common Stock as reported on the Nasdaq Capital Market for any fifteen (15) consecutive trading days immediately prior to such date
(“15-Day Average Price”) is greater than or equal to the corresponding Target Price set forth in the table above, provided that Executive remains employed by the Company as of the applicable
vesting date. Notwithstanding the foregoing, if a 

  
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Qualifying Event (as defined below) is completed prior to the fourth anniversary of the date hereof, any remaining RSU’s granted under this Agreement shall immediately vest, provided that
Executive remains employed by the Company on the date such Qualifying Event is completed. Notwithstanding anything to the contrary in this Agreement, all RSU’s that have not vested on or before the fourth anniversary of the date hereof shall be
forfeited and shall have no further effect. 
 For the purposes of this section, the occurrence of any of the following with Board and, if
required by law, shareholder approval shall constitute a “Qualifying Event”: (x) the Company publicly discloses its intent to terminate its registration of the Common Stock under Section 12(g) of the Securities and Exchange Act of
1934 (the “Exchange Act”); (y) the Company shall have commenced a self-tender offer for not less than 33% of the Company’s shares of Common Stock outstanding immediately preceding such self-tender offer at an offer price at least
equal to the 15-Day Average Price applicable on the date such offer price is determined by the Company’s Board of Directors; and (z) the Company shall have completed any other extraordinary
transaction in which more than 15% of the Company’s current outstanding shares were issued as part of such transaction. 
 Any dividends
paid in cash, securities or other property by the Company shall reduce the Target Price set forth in the above table by an amount equal to the value of such dividend. 

(d)    Employee Benefit Plans. The Executive shall be eligible to participate in all employee benefit plans offered
by the Company, but participation shall be subject to all of the terms and conditions of such plans applicable to all such employees, including all waiting periods, eligibility requirements, contributions, exclusions and other similar conditions or
limitations. 
 (e)    Vacation. The Executive shall be entitled to accrue twenty (20) vacation days per
calendar year, which vacation days shall accrue proportionately throughout the year based on completed months of service. Any unused vacation days shall be carried forward from one calendar year to the next. For purposes of this Agreement, the term
“Termination Vacation Pay” shall mean, at the time of a termination of the Executive’s employment hereunder, the payment due to the Executive at the rate of the Annual Salary in effect at that time, on a daily basis, multiplied by the
number of earned and unused vacation days up until the Termination Date. 
 (f)    Other Expenses. The Company
shall reimburse the Executive for all reasonable and ordinary out-of-pocket business expenses incurred by the Executive in the scope of his employment hereunder. This
shall include all reasonable travel and hotel expenses when Executive is traveling to, and while residing in, Illinois on Company business. The Executive shall submit itemized expense reports in order to obtain reimbursement of expenses and shall
submit with such expense reports such records and logs as may be required by the relevant taxing authorities for the substantiation of each such business expense as a deduction on the Company’s income tax returns. 

  
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 Section 4.    Termination of
Employment.    The Executive’s employment with the Company shall be subject to termination as follows: 

(a)    Termination for Cause. The Company may immediately terminate the Executive for Cause (as
defined below) by giving written notice to the Executive. In the event of a termination for Cause, the Executive shall be entitled to payment of (i) that portion of any of Executive’s Annual Salary that the Executive earned through and
including the Termination Date, at the rate of the Annual Salary in effect at that time, (ii) any Termination Vacation Pay, and (iii) any bonus earned prior to the Termination Date that remains unpaid, subject to any offset or recoupment
rights of the Company and any other rights or remedies applicable to any breach of this Agreement by the Executive prior to the Termination Date. Except as provided herein or required by applicable law, the Executive shall not be entitled to any
other compensation or benefits. Termination for “Cause” shall mean termination by the Board of the Executive’s employment with the Company, after a good faith determination by the Board at a meeting called and held for that
purpose, or in a written consent to resolutions signed by all members of the Board, and after reasonable notice to the Executive, that the Executive: 

(i)    has willfully engaged in misconduct materially and adversely affecting the Company; 

(ii)    engaged in theft, fraud, embezzlement or similar behavior; 

(iii)    has been indicted or convicted of a felony; or 

(iv)    has willfully continued, after a correction period, to fail to substantially perform the material
duties of Executive’s position with the Company (other than failure resulting from incapacity due to physical or mental illness). The correction period shall last not less than ten (10) days after the Company provides Executive with
written notice of Executive’s failure to substantially perform Executive’s material duties. 

(b)    Termination Without Cause. The Company may, in its sole discretion, terminate the Executive
without Cause, by providing written notice to the Executive (the “Termination Notice”) at least thirty (30) calendar days prior to the Termination Date. In the event of a termination without Cause, the Executive shall be
entitled to: (i) payment of that portion of any Executive’s Annual Salary that the Executive earned through and including the Termination Date, at the rate of the Annual Salary in effect at that time; (ii) any Termination Vacation
Pay; (iii) any bonus earned prior to the Termination Date that remains unpaid; (iv) payment of Executive’s Annual Salary, at the rate of the Annual Salary in effect at that time, commencing on the Termination Date and continuing for
the twelve (12) month period thereafter; (v) immediate vesting of any RSU’s granted pursuant to Section 3(c); provided, however, that the Executive executes and delivers to the Company a complete release agreement
in form and substance reasonably acceptable 

  
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to the Company, but excluding payments set forth in this paragraph 4(b). In addition, the Company shall be obligated to continue any health and welfare benefits provided to the Executive under
Section 3(d) throughout the period commencing on the Termination Date and continuing for a twelve (12) month period thereafter. Except as provided herein or required by applicable law, the Executive shall not be entitled to any other
compensation or benefits. With respect to Section 4(b) (iv) above, such payments shall be paid in accordance with the then-prevailing payroll practices of the Company, less applicable taxes, payroll deductions and
withholdings required by law. 
 (c)    Resignation. The Executive may resign from his employment
with the Company at any time by providing written notice to the Company thirty (30) calendar days prior to the Resignation Date. In the event of resignation, the Executive shall be entitled to payment of that portion of the Executive’s
Annual Salary that the Executive earned through and including the Resignation Date, at the rate of the Annual Salary in effect at that time, any Termination Vacation Pay and any bonus earned prior to the Resignation Date that remains unpaid. Except
as provided herein (including, without limitation, in Section 4(d)) or required by applicable law, the Executive shall not be entitled to any other compensation or benefits. 

(d)    Resignation for Good Reason. Notwithstanding Section 4(c), the Executive may terminate
his employment by the Company for Good Reason (as defined below) by providing written notice thereof to the Company (the “Resignation Notice”) at least thirty (30) days prior to the Resignation Date, which notice shall set
forth in reasonable detail the nature of the facts and circumstances which constitute “Good Reason” (as defined below) and Company shall have thirty (30) days after receipt of the Resignation Notice to cure in all material
respects the facts and circumstances which constitute Good Reason. In the event of a termination for Good Reason, the Executive shall be entitled to: (i) payment of that portion of the Executive’s Annual Salary that the Executive earned
through and including the Resignation Date, at the rate of the Annual Salary in effect at that time; (ii) any Termination Vacation Pay; (iii) any bonus earned prior to the Resignation Date that remains unpaid; (iv) payment of
Executive’s Annual Salary, at the rate of the Annual Salary in effect at that time, commencing on the Resignation Date and continuing for the twelve (12) month period thereafter; (v) immediate vesting of any RSU’s granted
pursuant to Section 3(c); provided, however, that the Executive executes and delivers to the Company a complete release agreement in form and substance reasonably acceptable to the Company. In addition, the Company shall be
obligated to continue any health and welfare benefits provided to the Executive under Section 3(d) throughout the period commencing on the Termination Date and continuing for a twelve (12) month period thereafter. Except as provided
herein or required by applicable law, the Executive shall not be entitled to any other compensation or benefits. With respect to Section 4(d)(iv) above, such payments shall be paid in accordance with the then-prevailing payroll practices of
the Company, less applicable taxes, payroll deductions and withholdings required by law. 
 For purposes of this Agreement,
“Good Reason” means the resignation of the Executive’s employment by the Company by the Executive, because of (A) any reduction in the Executive’s Annual Salary then in effect in a manner that is not permitted under

  
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Section 3(a) hereof, (B) a substantial diminution in the duties, responsibilities or titles of the Executive, but only if uncured in accordance with the foregoing provisions hereof,
or (C) being required by the Board to work in the Company’s office located in any place other than in the New York metropolitan area for more than 12 days in any one month in order to maintain employment with the Company pursuant to this
Agreement. 
 (e)    Termination Subsequent To A Change In Control. Notwithstanding anything to
the contrary herein, in the event that the Company, at any time within two (2) years after a Change in Control, terminates the Executive without Cause or the Executive resigns with Good Reason, the Executive shall be entitled to the payments
and benefits set forth in Sections 4(b) or 4(d), as the case may be, except that, in lieu of the payment pursuant to Section 4(b)(iv) and 4(d)(iv), the Company shall pay to the Executive a lump sum payment within thirty
(30) days of the Termination Date or Resignation Date, as applicable. The lump sum payment shall be equal to the Executive’s Annual Salary at the time of the Termination Date or Resignation Date, as the case may be, less all applicable
taxes, payroll deductions and withholdings required by law. In addition, any unvested RSU’s shall immediately be fully vested. 

Notwithstanding the preceding sentence, if the independent accountants acting as auditors for the Company on the date of the
Change in Control determine that such single payment, together with other compensation received by the Executive, would constitute “excess parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as
amended, and regulations thereunder, the single payment to the Executive shall be reduced to the maximum amount which may be paid without such payments in the aggregate constituting “excess parachute payments,” provided that such amount
shall not be reduced below the payment as set forth in Section 4(b)(iv) or 4(d)(iv) as referenced above. 

(f)    Death. If the Executive dies, his employment with the Company and this Agreement shall
automatically terminate on the date of his death. The Executive’s estate or personal representative shall be entitled to receive that portion of the Annual Salary that the Executive earned through and including the date of the Executive’s
death, at the rate of the Annual Salary in effect at that time, any Termination Vacation Pay and any bonus earned prior to the date of the Executive’s death that remains unpaid. Except as provided herein or required by applicable law, neither
the Executive’s estate nor his personal representative shall be entitled to any other compensation or benefits. 

(g)    Disability. The Executive shall be deemed “Permanently Disabled” when he has
suffered any medically determinable physical or mental illness, injury or infirmity that prevents the Executive from performing his responsibilities under this Agreement and which disability has lasted or that the Board in good faith has determined
can be expected to last for a continuous period of not less than 120 calendar days. The Board has the discretion to determine whether the Executive is disabled and that determination shall be binding and conclusive on the Executive (and any
guardians or representatives for him). If the Executive becomes Permanently Disabled, the Company may terminate the Executive’s employment with the Company as a result of the Permanent Disability by providing written notice to the Executive
thirty (30) calendar days prior to the 

  
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Termination Date, or the Executive may resign from his employment with the Company by providing written notice to the Company thirty (30) calendar days prior to the Resignation Date. If the
Executive resigns from employment with the Company as a result of a Permanent Disability or the Company terminates the Executive’s employment as a result of a Permanent Disability, the Executive shall be entitled to receive that portion of the
Annual Salary, at the rate in effect when he became Permanently Disabled, that he earned through and including the Termination Date or Resignation Date, as applicable, less any amounts the Executive is entitled to receive under any disability
insurance policy maintained by the Company, any Termination Vacation Pay and any bonus earned prior to the Termination Date or Resignation Date, as applicable, that remains unpaid. Except as provided herein or required by applicable law, the
Executive shall not be entitled to any other compensation or benefits. 
 (h)    Savings Clause.
This paragraph 4(h) shall apply for so long as the Executive is a “specified employee” for purposes of Section 409A of the Code. The determination of whether the Executive is a “specified employee” shall be made in accordance
with the policy of the Company or, if none, under the default rules in Section 1.409A-1(i) of the Treasury Regulations. Any amount otherwise payable to the Executive on account of the Executive’s
separation from service as defined in Section 1.409A-1(h) of the Treasury Regulations that exceeds the limit provided in Section 1.409A-1(b)(9)(iii) of the Treasury
Regulations shall not be paid before the date which is six (6) months and a day after the date of the Executive’s separation from service (or, if earlier, the date of the Executive’s death). Upon the expiration of the six-month deferral period referred to in the preceding sentence or the Executive’s death, all payments deferred pursuant to the preceding sentence shall be paid to the Executive (or the Executive’s estate
in the event of the Executives death) in a lump sum. 

Section 5.    Confidentiality. For purposes of this
Section 5, the term “Company” shall include, in addition to the Company, its affiliates, subsidiaries and any of their respective predecessors, successors and assigns. 

(a)    Confidential Information. As used in this Agreement, “Confidential
Information” means any and all confidential, proprietary or other information, whether or not originated by the Executive or the Company, which is in any way related to the past or present Company’s Business and is either designated as
confidential or not generally known by or available to the public. Confidential Information includes, but is not limited to (whether or not reduced to writing or designated as confidential) (i) information regarding the Company’s existing
and potential customers and vendors; (ii) any contracts (including the existence and contents thereof and parties thereto) to which the Company is a party or is bound; (iii) information regarding products and services being purchased or
leased by or provided to the Company; (iv) information received by the Company from third parties under an obligation of confidentiality, restricted disclosure or restricted use; (v) personnel and financial information of the Company;
(vi) information with respect to the Company’s products, services, facilities, business methods, systems, trade secrets, technical know-how, and other intellectual property; and (vii) marketing
and developmental plans and techniques, price and cost data, forecasts and forecast assumptions, and potential strategies of the Company. 

  
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(b)    Non-Disclosure and Non-Use of Confidential Information. The Executive acknowledges that the Confidential Information of the Company is a valuable, unique asset of the Company and the Executive’s use or disclosure thereof could
cause irreparable harm to the Company for which no remedy at law could be adequate. Accordingly, the Executive agrees that he shall hold all Confidential Information of the Company in strict confidence and solely for the benefit of the Company, and
that, except as necessary in the course of Executive’s duties as an employee of the Company, he shall not, directly or indirectly, disclose or use or authorize any third party to disclose or use any Confidential Information. The Executive shall
follow all the Company policies and procedures to protect all Confidential Information and take any additional precautions necessary to preserve and protect the use or disclosure of any Confidential Information at all times. 

(c)    Ownership of Confidential Information. The Executive acknowledges and agrees that all
Confidential Information is and shall remain the exclusive property of the Company, whether or not prepared in whole or in part by the Executive and whether or not disclosed to or entrusted to the custody of the Executive. Upon the termination or
resignation of his employment by the Company, or at any other time at the request of the Company, the Executive shall promptly deliver to the Company all documents, tapes, disks, or other storage media and any other materials, and all copies thereof
in whatever form, in the possession of the Executive pertaining to the Company’s Business, including, but not limited to, any containing Confidential Information. 

(d)    [Intentionally Left Blank]. 

(e)    Survival. The Executive’s obligations set forth in this
Section 5, and the Company’s rights and remedies with respect hereto, shall indefinitely survive the termination of this Agreement and the Executive’s employment by the Company, regardless of the reason therefor.

 Section 6.    Restrictive Covenants. For purposes of this
Section 6, the term “Company” shall include, in addition to the Company, its affiliates, subsidiaries and any of their respective predecessors, successors and assigns. 

(a)    Non-Competition. The Executive shall not, during the Restricted Period and within the
Restricted Area (each as defined in subsection (c) below), directly or indirectly, perform on behalf of any Competitor (as defined in subsection (c) below) the same or similar services as those that Executive performed for the
Company during the Executive’s employment by the Company or otherwise. In addition, the Executive shall not, during the Restricted Period or within the Restricted Area, directly or indirectly engage in, own, manage, operate, join, control, lend
money or other assistance to, or participate in or be connected with (as an officer, director, member, manager, partner, shareholder, consultant, employee, agent, or otherwise), any Competitor. 

  
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 (b)    Non-Solicitation. During the Restricted Period,
the Executive shall not, directly or indirectly, for himself or on behalf of any Person (as defined in subsection (c) below), (i) solicit or attempt to solicit any Customers (as defined in subsection (c) below), or prospective Customers,
with whom the Executive had contact at any time during the Executive’s employment by the Company, or about whom the Executive learned Confidential Information; (ii) divert or attempt to divert any business of the Company to any other
Person; (iii) solicit or attempt to solicit for employment, endeavor to entice away from the Company, recruit, hire, or otherwise interfere with the Company’s relationship with, any Person who is currently employed by or otherwise engaged
to perform services for the Company (or was employed or otherwise engaged to perform services for the Company, as of any given time, within the immediately preceding twenty-four (24) month period); (iv) cause or assist, or attempt to cause or
assist, any current employee or other service provider to leave the Company; or (v) otherwise interfere in any manner with the employment or business relationships of the Company or the business or operations then being conducted by the
Company. 
 (c)    Definitions. For purposes of this Section 6, the
following definitions have the following meanings: 
 (i)     “Competitor” means any
Person that engages in a business that is the same as, or similar to, the Company’s Business. 

(ii)    “Customer” means any Person which, as of any given date, used or purchased or
contracted to use or purchase any services or products from the Company within the immediately preceding twenty-four (24) month period. 

(iii)    “Person” means any individual, corporation, partnership, joint venture,
association, limited liability company, joint-stock company, trust, or unincorporated organization, or any governmental agency, officer, department, commission, board, bureau, or instrumentality thereof. 

(iv)    “Restricted Area” means, because the market for Company’s Business is global,
or has the potential of being global, and is not dependent upon the physical location or presence of the Company, the Executive, or any individual or entity that may be in violation of this Agreement, the broadest geographic region enforceable by
law (excluding any location where this type of restriction is prohibited by law) as follows: (A) everywhere in the world that has access to Company’s Business because of the availability of the Internet; (B) everywhere in the world
that the Executive has the ability to compete with Company’s Business through the Internet; (C) each state, commonwealth, territory, province and other political subdivision located in North America; (D) each state, commonwealth,
territory and other political subdivision of the United States of America; (E) any state in which the Executive has performed any services for the Company; (F) any geographical area in which the Company has performed any services or sold
any products; (G) any geographical area in which the Company or any of its subsidiaries have engaged in Company’s Business, which has resulted in aggregate sales revenues of at least $25,000 during any year

  
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in the five (5) year period immediately preceding the commencement of the Restricted Period; (H) any state or other jurisdiction where the Company had an office at any time during the
Executive’s employment by the Company; (I) within one hundred (100) miles of any location in which the Company had an office at any time during the Executive’s employment by the Company; and (J) within one hundred
(100) miles of any location in which the Executive provided services for the Company. 

(v)    “Restricted Period” means the period of time during the Executive’s employment
by the Company plus a period of twelve (12) months from the Termination Date or Resignation Date, as applicable. In the event of a breach of this Agreement by the Executive, the Restricted Period will be extended automatically by the period of
the breach. 
 (d)    Survival. The Executive’s obligations set forth in this
Section 6, and the Company’s rights and remedies with respect thereto, will remain in full force and effect during the Restricted Period and until full resolution of any dispute related to the performance of the
Executive’s obligations during the Restricted Period. 
 (e)    Public Company Exception. The
prohibitions contained in this Section 6 do not prohibit the Executive’s ownership of stock which is publicly traded, provided that (1) the investment is passive, (2) the Executive has no other involvement
with the company, (3) the Executive’s interest is less than five (5%) percent of the shares of the company, and (4) the Executive makes full disclosure to the Company of the stock at the time that the Executive acquires the shares of
stock. 
 Section 7.    Assignment of Inventions. Any and all inventions, improvements, discoveries,
designs, works of authorship, concepts or ideas, or expressions thereof, whether or not subject to patents, copyrights, trademarks or service mark protections, and whether or not reduced to practice, that are conceived or developed by the Executive
while employed with the Company and which relate to or result from the actual or anticipated business, work, research or investigation of the Company (collectively, “Inventions”), shall be the sole and exclusive property of the
Company. The Executive shall do all things reasonably requested by the Company to assign to and vest in the Company the entire right, title and interest to any such Inventions and to obtain full protection therefor. Notwithstanding the foregoing,
the provisions of this Agreement do not apply to an Invention for which no equipment, supplies, facility, or Confidential Information of the Company was used and which was developed entirely on the Executive’s own time, unless (a) the
Invention relates (i) to Company’s Business, or (ii) to the Company’s actual or demonstrably anticipated research or development, or (b) the Invention results from any work performed by the Executive for the Company. 

 Section 8.    Reasonableness; Remedies; Claims. 

(a)    Reasonableness. The Executive has carefully considered the nature, extent and duration of the
restrictions and obligations contained in this Agreement, including, without limitation, the geographical coverage contained in Section 6 and the time periods contained in Section 5 and
Section 6, and acknowledges and agrees that 

  
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such restrictions are fair and reasonable in all respects to protect the legitimate interests of the Company and that these restrictions are designed for the reasonable protection of
Company’s Business. 
 (b)    Remedies. The Executive recognizes that any breach of this
Agreement shall cause irreparable injury to the Company, inadequately compensable in monetary damages. Accordingly, in addition to any other legal or equitable remedies that may be available to the Company, the Executive agrees that the Company
shall be able to seek and obtain injunctive relief in the form of a temporary restraining order, preliminary injunction, or permanent injunction, in each case without notice or bond, against Executive to enforce this Agreement. The Company shall not
be required to demonstrate actual injury or damage to obtain injunctive relief from the courts. To the extent that any damages are calculable resulting from the breach of this Agreement, the Company shall also be entitled to recover damages,
including, but not limited to, any lost profits of the Company and/or its affiliates or subsidiaries. For purposes of this Agreement, lost profits of the Company shall be deemed to include all gross revenues resulting from any activity of the
Executive in violation of this Agreement and all such revenues shall be held in trust for the benefit of the Company. Any recovery of damages by the Company shall be in addition to and not in lieu of the injunctive relief to which the Company is
entitled. In no event will a damage recovery be considered a penalty in liquidated damages. In addition, in any action at law or in equity arising out of this Agreement, the prevailing party shall be entitled to recover, in addition to any damages
caused by a breach of this Agreement, all costs and expenses, including, but not limited to, reasonable attorneys’ fees, expenses, and court costs incurred by such party in connection with such action or proceeding. Without limiting the
Company’s rights under this Section 7(b) or any other remedies of the Company, if a court of competent jurisdiction determines that the Executive breached any of the provisions of Sections 5 or 6, the Company will have the
right to cease making any payments or providing any benefits otherwise due to the Executive under the terms and conditions of this Agreement. 

(c)    Claims by the Executive. The Executive acknowledges and agrees that any claim or cause of
action by the Executive against the Company shall not constitute a defense to the enforcement of the restrictions and covenants set forth in this Agreement and shall not be used to prohibit injunctive relief. 

Section 9.    Nonassignability, Binding Agreement. 

(a)    By the Executive. The Executive shall not assign, transfer or delegate this Agreement or any
right, duty, obligation, or interest under this Agreement without the Company’s prior written consent; provided, however, that nothing shall preclude the Executive from designating beneficiaries to receive compensation or benefits, if any,
payable under this Agreement upon his death. 
 (b)    By the Company. The Company shall not
assign, transfer or delegate this Agreement or any right, duty, obligation or intent under this Agreement without the Executive’s prior written consent; provided, however, that the Company may assign this Agreement and all of its rights and
obligations hereunder to any person who or entity that shall acquire all or substantially all of the assets and properties of the Company in a bona fide sale transaction. 

  
 -12- 

 (c)    Binding Effect. This Agreement shall be binding
upon and inure to the benefit of the parties, any successors or assigns of the Company and the Executive’s heirs and the personal representative(s) or executor(s) of the Executive’s estate. 

Section 10.    Definitions. The following capitalized terms shall have, throughout
this Agreement, the following meanings: 
 (a)     “Resignation Date” shall mean the
date specified in the Resignation Notice, or the actual date the Executive terminates employment with the Company as the result of a resignation as provided in whichever occurs earlier. 

(b)    “Termination Date” shall mean the actual date the Executive ceases to be employed
with the Company as a result of action taken by the Company, and not as a result of Executive’s resignation from employment. 

Section 11.    Judicial Modification and Severability. Executive agrees that if a
court of competent jurisdiction should determine that any phrase or provision in this Agreement is invalid or unenforceable as written for any reason, the court shall modify and enforce any such phrase or provision to the maximum extent reasonably
necessary to protect the Company’s legitimate business interests, so long as the modification does not render the phrase or provision more restrictive with regard to Executive than originally drafted. Executive further agrees that if such
modification of a phrase or provision that is invalid or unenforceable as written is legally impossible, the Court shall sever any such phrase or provision from this Agreement, and that the enforceability of all other provisions of this Agreement
shall not be affected, but shall otherwise remain in full force and effect. 

Section 12.    Amendment. This Agreement may not be modified, amended, or waived
in any manner except by a written instrument signed by both parties to this Agreement. 

Section 13.    Waiver. The waiver by any party of compliance by any other party
with any provision of this Agreement shall not operate or be construed as a waiver of any other provision of this Agreement (whether or not similar), or a continuing waiver or a waiver of any subsequent breach by a party of a provision of this
Agreement. Performance by any of the parties of any act not required of it under the terms and conditions of this Agreement shall not constitute a waiver of the limitations on its obligations under this Agreement, and no performance shall estop that
party from asserting those limitations as to any further or future performance of its obligations. 

Section 14.    Governing Law and Forum. This Agreement shall be governed,
construed and enforced in accordance with the laws of the State of Illinois, without regard to principles of conflict of laws of such State. Any action to enforce this Agreement shall be brought solely in the state or federal courts located in the
City of Chicago, Illinois. 
 Section 15.    Notices. All notices required or
desired to be given under this Agreement shall be in writing and shall be deemed to have been given if delivered in person and receipted 

  
 -13- 

 
for by the party to whom the notice is directed; mailed by certified or registered United States mail postage prepaid, not later than the day upon which the notice is required to be given
pursuant to this Agreement; or delivered by expedited courier, shipping prepaid or mailed to sender, on the next business day, after the date on which it is so sent, and addressed as follows: 

 

					
	 If to the Company, to:
	  	 Board of Directors
	  	
		  	 Rubicon Technology, Inc.
	  	
		  	 900 East Green Street, Unit A
	  	
		  	 Bensenville, IL 60106
	  	
			
	 If to the Executive, to:
	  	 Timothy E. Brog
	  	
		  	 351 West Hill Road
	  	
		  	 Stamford, CT 06902
	  	

 Either party may, by giving written notice to the other party, change the address to which notice shall then
be sent. 
 Section 16.    Prior Agreements. This Agreement is a complete
and total integration of the understanding of the parties related to the Executive’s employment with the Company and supersedes all prior or contemporaneous negotiations, commitments, agreements, writings, and discussions with respect to the
subject matter of this Agreement. This Agreement shall not be integrated nor supersede any commitments, agreements, writings, and discussions with respect to the Executive’s prior service as a member of the Company’s Board of Directors.

 Section 17.    Headings. The headings of the sections of this Agreement are
inserted solely for convenience of reference and shall not be deemed to affect the meaning or interpretation of this Agreement. 

Section 18.    Counterparts. This Agreement may be executed in two
(2) counterparts, each of which shall be deemed to be an original, but both of which together shall constitute one and the same Agreement. 

Section 19.    Statutory and Common Law Duties. The duties the Executive
owes to the Company under this Agreement shall be deemed to include federal and state statutory and common law obligations of the Executive, and do not in any way supersede or limit any of the obligations or duties the Executive owes to the Company.
This Agreement is intended, among other things, to supplement the provisions of the Illinois Uniform Trade Secrets Act, as enacted and amended from time to time. 

Section 20.    Executive Acknowledgments. 

(a)    The Executive Has Read the Document. The Executive acknowledges and agrees that he has
carefully read this entire Agreement and has been given sufficient opportunity to discuss this Agreement with the Company before signing. 

(b)    The Executive Has Had an Opportunity to Consult with Others. The Executive acknowledges and
agrees that he has been given an adequate opportunity to consult with his lawyer, accountant, tax advisor, spouse and other persons he deems appropriate concerning this Agreement and the terms and conditions hereof. 

  
 -14- 

 (c)    Executive Has a Copy. The Executive
acknowledges and agrees that he has been given a copy of this Agreement. 
 (d)    Signing is
Acceptance. By signing, the Executive agrees to accept all of the terms and conditions of this Agreement and understands that the Company is relying upon the Executive’s stated acceptance of such terms and conditions. 

[SIGNATURE PAGE FOLLOWS] 

  
 -15- 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date set forth above. 

 

									
	“COMPANY”	 		 	“EXECUTIVE”
				
	RUBICON TECHNOLOGY, INC.	 		 		 	
					
	By:	 	 /s/ Don Aquilano
	 		 	By:	 	 /s/ Timothy E. Brog

		 	Don Aquilano	 		 		 	Timothy E. Brog
		 	Chairman of the Board of Directors	 		 		 	

  
 -16-EX-4.1

 Exhibit 4.1 
  

 
  

 
 T-MOBILE USA, INC. 
 AND EACH OF THE GUARANTORS PARTY HERETO 

 
  

4.000% SENIOR NOTES DUE 2022 

TWENTY-THIRD SUPPLEMENTAL INDENTURE 

Dated as of March 16, 2017 
  

 
 DEUTSCHE BANK
TRUST COMPANY AMERICAS 
 as Trustee 
  

 
  

 

 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
	ARTICLE I.	 	DEFINITIONS AND INCORPORATION BY REFERENCE	  	 	1	 
			
	Section 1.01	 	Definitions	  	 	1	 
	Section 1.02	 	Other Definitions	  	 	9	 
	Section 1.03	 	Rules of Construction	  	 	9	 
			
	ARTICLE II.	 	THE NOTES	  	 	10	 
			
	Section 2.01	 	Creation of the Notes; Designations	  	 	10	 
	Section 2.02	 	Forms Generally	  	 	10	 
	Section 2.03	 	Title and Terms of Notes	  	 	11	 
	Section 2.04	 	Transfer and Exchange	  	 	12	 
			
	ARTICLE III.	 	REDEMPTION AND PREPAYMENT	  	 	13	 
			
	Section 3.01	 	Optional Redemption	  	 	13	 
	Section 3.02	 	Redemption Procedures	  	 	13	 
			
	ARTICLE IV.	 	COVENANTS	  	 	13	 
			
	ARTICLE V.	 	MISCELLANEOUS	  	 	17	 
			
	Section 5.01	 	Effect of Twenty-Third Supplemental Indenture	  	 	17	 
	Section 5.02	 	Governing Law	  	 	17	 
	Section 5.03	 	Waiver of Jury Trial	  	 	17	 
	Section 5.04	 	No Adverse Interpretation of Other Agreements	  	 	17	 
	Section 5.05	 	Successors	  	 	17	 
	Section 5.06	 	Severability	  	 	17	 
	Section 5.07	 	Counterparts	  	 	18	 
	Section 5.08	 	Table of Contents, Headings, etc.	  	 	18	 
	Section 5.09	 	Beneficiaries of this Twenty-Third Supplemental Indenture	  	 	18	 
	Section 5.10	 	No Personal Liability of Directors, Officers, Employees and Stockholders	  	 	18	 
	Section 5.11	 	The Trustee	  	 	18	 
			
	ARTICLE VI.	 	DEFUALTS AND REMEDIES	  	 	19	 
			
	Section 6.01	 	Events of Default	  	 	19	 

  
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 TABLE OF CONTENTS 

(continued) 
  

					
	 	  	Page	 
	ARTICLE VII. [RESERVED]	  	 	19	 
		
	ARTICLE VIII. [RESERVED]	  	 	19	 
		
	ARTICLE IX. [RESERVED]	  	 	19	 
		
	ARTICLE X. [RESERVED]	  	 	19	 

  
 -ii- 

 EXHIBITS 
  

			
	Exhibit A	  	Form of Initial Note

  
 -iii- 

 TWENTY-THIRD SUPPLEMENTAL INDENTURE (this “Twenty-Third Supplemental Indenture”),
dated as of March 16, 2017 (the “Series Issue Date”), among T-Mobile USA, Inc., a Delaware corporation (the “Company”), the Guarantors party hereto and
Deutsche Bank Trust Company Americas, a New York banking corporation, as Trustee. 
 WHEREAS, the Company has heretofore executed and delivered an
Indenture, dated as of April 28, 2013 (the “Base Indenture”), among the Company, the Guarantors party thereto and the Trustee, providing for the issuance from time to time of one or more Series of the Company’s
Notes; 
 WHEREAS, Section 2.02 of the Base Indenture permits the forms and terms of the Notes of any Series as permitted in Sections 2.01 and 2.02 of
the Base Indenture to be established in a supplemental indenture to the Base Indenture; 
 WHEREAS, the Company has requested the Trustee to join with it
and the Guarantors in the execution of this Twenty-Third Supplemental Indenture in order to supplement the Base Indenture by, among other things, establishing the forms and certain terms of a Series of Notes to be known as the Company’s 4.000%
Senior Notes due 2022 and adding certain provisions thereto for the benefit of the Holders of the Notes of such Series; 
 WHEREAS, the Company has
furnished the Trustee with a duly authorized and executed Company Order dated March 16, 2017 authorizing the execution of this Twenty-Third Supplemental Indenture and the issuance of the Notes established hereby; and 

WHEREAS, all things necessary to make this Twenty-Third Supplemental Indenture a valid, binding and enforceable agreement of the Company, the Guarantors and
the Trustee and a valid supplement to the Base Indenture have been done; 
 NOW, THEREFORE, the Company, the Guarantors and the Trustee agree as follows for
the benefit of each other and for the equal and ratable benefit of the Holders of the Notes established hereby: 
 ARTICLE I. 

DEFINITIONS AND INCORPORATION BY REFERENCE 

Section 1.01    Definitions. 

The Base Indenture, as supplemented by the Eleventh Supplemental Indenture, dated as of May 1, 2013, by and among the Company, the guarantors party
thereto and the Trustee, the Sixteenth Supplemental Indenture, dated as of August 11, 2014, by and among the Company, the guarantors party thereto and the Trustee, the Nineteenth Supplemental Indenture, dated as of September 28, 2015, by
and among the Company, the guarantors party thereto and the Trustee, and the Twenty-Second Supplemental Indenture, dated as of August 30, 2016, by and among the Company, the guarantors party thereto and the Trustee, and as amended and
supplemented in respect of the Notes by this Twenty-Third Supplemental Indenture is collectively referred to as the “Indenture.” All capitalized terms which are used herein and not otherwise defined herein are defined in the
Base Indenture and are used herein with the same meanings as in the Base Indenture. If a capitalized term is defined both in the Base Indenture and this Twenty-Third Supplemental Indenture, the definition in this Twenty-Third Supplemental Indenture
shall apply to the Notes established hereby (and any Note Guarantee in respect thereof). 

 “2025 Notes” means the $500,000,000 in principal amount of the Company’s 5.125%
Senior Notes due 2025 issued pursuant to the Base Indenture, as supplemented by that certain Twenty-Fourth Supplemental Indenture dated as of March 16, 2017, among T-Mobile USA, Inc., the guarantors named
therein and Deutsche Bank Trust Company Americas, as trustee. 
 “2027 Notes” means the $500,000,000 in principal amount of the
Company’s 5.375% Senior Notes due 2027 issued pursuant to the Base Indenture, as supplemented by that certain Twenty-Fifth Supplemental Indenture dated as of March 16, 2017, among T-Mobile USA, Inc.,
the guarantors named therein and Deutsche Bank Trust Company Americas, as trustee. 
 “$3.5B Notes” means the
$1,750,000,000 in principal amount of MetroPCS Wireless, Inc.’s 6.250% Senior Notes due 2021 and $1,750,000,000 in principal amount of MetroPCS Wireless, Inc.’s 6.625% Senior Notes due 2023, each issued as of March 19, 2013, pursuant
to the Indenture, between MetroPCS Wireless, Inc., MetroPCS, Inc., MetroPCS Communications, Inc., the guarantors party thereto, and Deutsche Bank Trust Company Americas, as supplemented by the First Supplemental Indenture dated March 19, 2013
or the Second Supplemental Indenture dated March 19, 2013 thereto, as applicable, as amended by the Third Supplemental Indenture dated April 29, 2013, as further supplemented by the Fourth Supplemental Indenture dated May 1, 2013,
among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, as further supplemented by the Fifth Supplemental Indenture, dated as of July 15, 2013, among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, as further supplemented by the Sixth Supplemental Indenture, dated as of August 11, 2014, among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, and as further supplemented by the Seventh Supplemental Indenture, dated as of September 28, 2015, among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee (as so supplemented and amended, the “$3.5B Notes Indenture”), (ii) any additional
6.250% Senior Notes due 2021 and 6.625% Senior Notes due 2023 issued under the $3.5B Notes Indenture as part of the same series, and (iii) any “Exchange Notes” (as defined in the $3.5B Notes Indenture) relating thereto. 

“Change of Control” means the occurrence of any of the following: 

(1)    the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all or substantially all of the properties or assets of the Company and its Restricted Subsidiaries taken as a whole to any “person” (as that term is used in Section
13(d) of the Exchange Act) other than any such disposition to a Restricted Subsidiary or a Permitted Holder; 

(2)    the adoption of a plan relating to the liquidation or dissolution of the Company; 

  
 -2- 

 (3)    the consummation of any transaction (including any
merger or consolidation), the result of which is that any “person” (as defined above), other than a Permitted Holder, becomes the Beneficial Owner, directly or indirectly, of more than 50% of the Voting Stock of Parent (or its successor by
merger, consolidation or purchase of all or substantially all of its assets or its equity), measured by voting power rather than number of shares; or 

(4)    the Company ceases to be a direct or indirect Wholly-Owned Subsidiary of Parent; 

provided that the Transactions and other transactions pursuant to the Business Combination Agreement (including the changes to the
Beneficial Ownership of the Voting Stock of Parent contemplated therein) shall not be a Change of Control. 
 “Closing
Date” means the date on which the Merger was consummated, or May 1, 2013. 
 “Consolidated Cash
Flow” means, with respect to any specified Person for any period, the Consolidated Net Income of such Person for such period plus, without duplication: 

(1)    provision for taxes based on income or profits of such Person and its Restricted Subsidiaries for
such period, to the extent that such provision for taxes was deducted in computing such Consolidated Net Income; plus 

(2)    the Consolidated Interest Expense of such Person and its Restricted Subsidiaries for such period, to
the extent that such Consolidated Interest Expense was deducted in computing such Consolidated Net Income; plus 

(3)    depreciation, amortization (including non-cash impairment
charges and any write-off or write-down or amortization of intangibles but excluding amortization of ordinary course prepaid cash expenses that were paid in a prior period) and other non-cash expenses or charges (excluding any such non-cash expense to the extent that it represents an ordinary course accrual of or reserve for cash expenses in any future
period or amortization of any ordinary course prepaid cash expense that was paid in a prior period) of such Person and its Restricted Subsidiaries for such period to the extent that such depreciation, amortization and other non-cash expenses or charges were deducted in computing such Consolidated Net Income; plus 

(4)    any net after-tax extraordinary, nonrecurring or unusual
gains or losses or income, expenses or charges (including all fees and expenses relating thereto), including (a) any fees, expenses and costs relating to the Towers Transaction, (b) any fees, expenses or charges related to any sale or
offering of Equity Interests of such Person or Parent, any acquisition or disposition or any Indebtedness, in each case that is permitted to be incurred hereunder (in each case, whether or not successful), or the offering, amendment or modification
of any debt instrument, including the offering, any amendment or other modification of the Notes of this Series, provided that Consolidated Cash Flow shall not be deemed to be increased by more than $250.0 million in any twelve-month
period pursuant to this clause (b), (c) any premium, penalty or fee paid in relation to any repayment, prepayment or repurchase of Indebtedness, (d) any fees or expenses relating to the 

  
 -3- 

 
Transactions and the offering, issuance and sale (in each case, whether or not successful) of the DT Notes and any “Exchange Notes” (as defined in the Base Indenture) issued in respect
thereof and the Permitted MetroPCS Notes and any “Exchange Notes” (as defined in the $3.5B Notes Indenture), and (e) restructuring charges, integration costs (including retention, relocation and contract termination costs) and related
costs and charges, provided such costs and charges under this clause (e) shall not exceed $300.0 million in any twelve-month period, plus, for the first four years after the Closing Date, up to an additional $300.0 million
in any twelve-month period related to the Transactions); plus 
 (5)    New Market Losses, up to a
maximum aggregate amount of $300.0 million in any twelve-month period; minus 

(6)    non-cash items increasing such Consolidated Net Income for
such period, other than the accrual of revenue in the ordinary course of business, in each case, on a consolidated basis and determined in accordance with GAAP. 

Notwithstanding the preceding, the provision for taxes based on the income or profits of, and the depreciation and amortization and other non-cash expenses of, a Restricted Subsidiary of the Company that is not a Subsidiary Guarantor will be added to Consolidated Net Income to compute Consolidated Cash Flow of the Company only to the extent that a
corresponding amount would be permitted at the date of determination to be dividended to the Company by such Restricted Subsidiary without prior governmental approval (that has not been obtained), and without direct or indirect restriction pursuant
to the terms of its charter and all agreements, instruments, judgments, decrees, orders, statutes, rules and governmental regulations applicable to that Restricted Subsidiary or its stockholders. 

For the avoidance of doubt, calculations of “Consolidated Cash Flow” of the Company for any period prior to the Closing Date for
purposes of calculating the Debt to Cash Flow Ratio shall be on a pro forma basis as described in the last paragraph of the definition of “Debt to Cash Flow Ratio.” 

“Credit Facilities” means, one or more debt facilities (including the Revolving Credit Facilities and any additional
notes issued pursuant to a Senior Notes Election thereunder and the Term Loan Credit Agreement), capital leases, purchase money financings or commercial paper facilities, providing for revolving credit loans, term loans, receivables financing
(including through the sale of receivables to such lenders or to special purpose entities formed to borrow from such lenders against such receivables), capital leases, purchase money debt, debt securities or letters of credit, in each case, as
amended, restated, modified, renewed, refunded, replaced (whether upon or after termination or otherwise) or refinanced (including, in each case, by means of sales of debt securities to institutional investors) in whole or in part from time to time.

 “December 2012 Sixth Supplemental Indenture” means the Sixth Supplemental Indenture, dated
as of December 14, 2012, among MetroPCS Wireless, Inc., the guarantors party thereto and Wells Fargo Bank, N.A., as trustee, to the September 2010 Senior Notes Indenture. 

“DT Notes” shall have the meaning assigned to such term in the Business Combination Agreement. 

  
 -4- 

 “Existing Indebtedness” means (a) Indebtedness of the Company and
its Subsidiaries (other than Indebtedness in respect of the DT Notes) in existence on the Closing Date, until such amounts are repaid, (b)(1) the $3.5B Notes in existence on the Closing Date (and any “Exchange Notes” (as defined in the
$3.5B Notes Base Indenture) relating thereto), and (2) all other Indebtedness of MetroPCS Wireless, Inc. and its Subsidiaries in existence on the Closing Date that was not incurred in violation of the terms of the Business Combination
Agreement, in each case until such amounts are repaid (provided that the aggregate principal amount of Indebtedness incurred in contemplation of the Transactions, including any Indebtedness in the form of the $3.5B Notes and notes issued on the date
of the Base Indenture, in each case permitted by this clause (b), shall not exceed $20.5 billion). 
 “Existing Senior
Notes” means (i) the $3.5B Notes existing on the Closing Date, (ii) the DT Notes existing on the Closing Date, (iii) the 5 1⁄4%
Senior Notes due 2018 issued pursuant to the Base Indenture, as supplemented by that certain Thirteenth Supplemental Indenture, dated as of August 21, 2013, by and among the Company, the guarantors named therein and the Trustee, (iv) the
6.125% Senior Notes due 2022 issued pursuant to the Base Indenture, as supplemented by that certain Fourteenth Supplemental Indenture dated as of November 21, 2013, by and among the Company, the guarantors named therein and the Trustee,
(v) the 6.500% Senior Notes due 2024 issued pursuant to the Base Indenture, as supplemented by that certain Fifteenth Supplemental Indenture dated as of November 21, 2013, among T-Mobile USA, Inc.,
the guarantors named therein and Deutsche Bank Trust Company Americas, as trustee, (vi) the 6.000% Senior Notes due 2023 issued pursuant to the Base Indenture, as supplemented by that certain Seventeenth Supplemental Indenture dated as of
September 5, 2014, among T-Mobile USA, Inc., the guarantors named therein and Deutsche Bank Trust Company Americas, as trustee, (vii) the 6.375% Senior Notes due 2025 issued pursuant to the Base
Indenture, as supplemented by that certain Eighteenth Supplemental Indenture dated as of September 5, 2014, among T-Mobile USA, Inc., the guarantors named therein and Deutsche Bank Trust Company Americas,
as trustee, (viii) the 6.500% Senior Notes due 2026 issued pursuant to the Base Indenture, as supplemented by that certain Twentieth Supplemental Indenture dated as of November 5, 2015, among
T-Mobile USA, Inc., the guarantors named therein and Deutsche Bank Trust Company Americas, as trustee and (ix) the 6.000% Senior Notes due 2024 issued pursuant to the Base Indenture, as supplemented by
that certain Twenty-First Supplemental Indenture dated as of April 1, 2016, among T-Mobile USA, Inc., the guarantors named therein and Deutsche Bank Trust Company Americas, as trustee. 

“Incremental Term Loan Facility” means the secured term loan facility entered into by Company pursuant
to the Term Loan Credit Agreement, as amended by that certain First Incremental Facility Amendment, dated as of December 29, 2016, by and among Parent, Deutsche Bank AG New York Branch, as administrative agent, the guarantors party thereto and
DT, as the initial incremental term loan lender, and that certain Second Incremental Facility Amendment, dated as of January 25, 2017, by and among Parent, Deutsche Bank, AG New York Branch, as administrative agent, the guarantors party thereto
and DT. 
 “Permitted Investments” means: 

(1)    any Investment in the Company or in any Restricted Subsidiary of the Company; 

  
 -5- 

 (2)    any Investment in Cash Equivalents; 

(3)    any Investment by the Company or any Restricted Subsidiary of the Company in a Person, if as a
result of such Investment: 
 (a)     such Person becomes a Restricted Subsidiary of the Company; or 

(b)     such Person is merged, consolidated or amalgamated with or into, or transfers or conveys
substantially all of its assets to, or is liquidated into, the Company or a Restricted Subsidiary of the Company; 

(4)    any Investment made as a result of the receipt of non-cash
consideration from an Asset Sale that was made pursuant to and in compliance with Section 4.10 of the Base Indenture; 

(5)    any acquisition of assets or Capital Stock solely in exchange for the issuance of Equity Interests
(other than Disqualified Stock) of the Company or Equity Interests of Parent; 
 (6)    any Investments
received in compromise or resolution of (A) obligations of trade creditors or customers that were incurred in the ordinary course of business of the Company or any of its Restricted Subsidiaries, including pursuant to any plan of reorganization
or similar arrangement upon the bankruptcy or insolvency of any trade creditor or customer; or (B) litigation, arbitration or other disputes with Persons who are not Affiliates; 

(7)    Investments represented by Hedging Obligations; 

(8)    loans or advances to employees made in the ordinary course of business of the Company or any
Restricted Subsidiary of the Company in an aggregate principal amount not to exceed $50.0 million at any one time outstanding; 

(9)    any payment on or with respect to, or purchase, redemption, defeasement or other acquisition or
retirement for value of (i) the Notes of this Series, and any Additional Notes of the same Series, (ii) the DT Notes, and any Additional Notes (as defined in the Base Indenture) of the same Series, and any Exchange Notes (as defined in the
Base Indenture) relating thereto, (iii) any of the $3.5B Notes or (iv) any other Indebtedness that is pari passu with the Notes of this Series; 

(10)    advances and prepayments for asset purchases in the ordinary course of business in a Permitted
Business of the Company or any of its Restricted Subsidiaries; 
 (11)    Investments existing on the
Closing Date, including Investments held by MetroPCS Wireless, Inc., the Company and their Subsidiaries immediately prior to the Merger; 

(12)    Investments in the ISIS Joint Venture having an aggregate Fair Market Value (measured on the date
each such Investment was made and without giving effect to subsequent changes in value), when taken together with all other Investments made pursuant to this clause (12) since the Closing Date that are at that time outstanding, not to exceed
$300.0 million; 

  
 -6- 

 (13)    Permitted Bond Hedge Transactions which constitute
Investments; 
 (14)    (a) Permitted Joint Venture Investments, and (b) other Investments in
any Person other than an Affiliate of the Company (excluding any Person that is an Affiliate of the Company solely by reason of Parent’s ownership, directly or indirectly, of Equity Interests or Parent’s control, of such Person or which
becomes an Affiliate as a result of such Investment), to the extent such Investment under (a) or (b) has an aggregate Fair Market Value (measured on the date each such Investment was made and without giving effect to subsequent changes in
value), when taken together with all other Investments made pursuant to this clause (14) that are at the time outstanding, not to exceed 12.5% of the Company’s Total Assets on the date of such Investment; 

(15)    Investments in a Person primarily engaged in a Permitted Business having an aggregate Fair Market
Value (measured on the date each such Investment was made and without giving effect to subsequent changes in value), when taken together with all other Investments made pursuant to this clause (15) since the Closing Date that are at that time
outstanding, not to exceed $250.0 million; 
 (16)    guarantees permitted under Section 4.09
hereof; and 
 (17)    deposits or payments made with the FCC in connection with the auction or licensing
of Governmental Authorizations; 
 (18)    any Investment deemed made from time to time pursuant to
Section 4.18 of the Base Indenture in connection with a Specified Unrestricted Subsidiary Designation, in an amount equal to the aggregate Fair Market Value of all outstanding Investments owned by the Company and its Restricted Subsidiaries in
the Subsidiaries designated as Unrestricted Subsidiaries pursuant to such Specified Unrestricted Subsidiary Designation, but only to the extent not in excess of the aggregate Fair Market Value of all outstanding Investments owned by the Company and
its Restricted Subsidiaries in such designated Subsidiaries as of the Closing Date (for this purpose, it shall be assumed, as regards to Investments in any Designated Tower Entity, that all wireless communications sites, towers, and related
contracts, equipment, improvements, real estate, and other assets of the Company and its Subsidiaries subject to the Towers Transaction that are contemplated to be transferred to the Designated Tower Entities in accordance with the terms of the
Towers Transaction, as contemplated in the Towers Transaction Agreements as in effect as of March 19, 2013, had been transferred to the Designated Tower Entities, whether or not all such transfers have in fact then taken place, but disregarding
any transfers of assets not part of the Towers Transaction as contemplated in the Towers Transaction Agreements as in effect as of March 19, 2013); 

(19)    any other Investments made in connection with the Towers Transaction, as contemplated in the Towers
Transaction Agreements as in effect as of March 19, 2013; and 

  
 -7- 

 (20)    other Investments; provided that the Debt to
Cash Flow Ratio calculated on a pro forma basis in the manner described in the definition of “Debt to Cash Flow Ratio” after giving effect to such Investment would be equal to or less than 3.50 to 1.00 

Notwithstanding any other provision to the contrary, no Permitted Investment shall be deemed to be a Restricted Payment. 

“Permitted MetroPCS Notes” shall have the meaning assigned to such term in the Business Combination Agreement.

 “Revolving Credit Facilities” means the revolving credit facilities entered into by the Company pursuant
to the Unsecured Revolving Credit Agreement, dated as of December 29, 2016, by and among the Company, Parent, and DT, as administrative agent and lender, and the Senior Secured Revolving Credit Agreement, dated as of December 29, 2016, by
and among the Company, Parent and DT, as administrative agent, collateral agent and lender. 
 “Secured Debt to
Cash Flow Ratio” means, with respect to any Person as of any date of determination, the ratio of (a) the Consolidated Indebtedness of such Person as of such date that is secured by a Lien to (b) the Consolidated
Cash Flow, less cash and Cash Equivalents, of such Person for the four most recent full fiscal quarters ending immediately prior to such date for which internal financial statements are available. 

For purposes of making the computation referred to above, the Secured Debt to Cash Flow Ratio shall be calculated on a pro forma basis in the
manner described in the second paragraph of the definition of “Debt to Cash Flow Ratio.” 
 “Senior Notes
Election” shall have the meaning assigned to such term in the Unsecured Revolving Credit Agreement, dated as of December 29, 2016, by and among the Company, Parent, and DT, as administrative agent and lender, and the Senior Secured
Revolving Credit Agreement, dated as of December 29, 2016, by and among the Company, Parent and DT, as administrative agent, collateral agent and lender. 

“September 2010 Senior Notes Indenture” means the Indenture, dated as of September 21, 2010,
as supplemented by the Second Supplemental Indenture, dated November 17, 2010, among MetroPCS Wireless, Inc., the guarantors party thereto and Wells Fargo Bank, N.A., as trustee, as supplemented by the Fourth Supplemental Indenture, dated as of
December 23, 2010, by MetroPCS Wireless, Inc., the guarantors party thereto and Wells Fargo Bank, N.A., as trustee, as further supplemented by the December 2012 Senior Notes Sixth Supplemental Indenture, as further supplemented by the Seventh
Supplemental Indenture, dated as of May 1, 2013, among T-Mobile USA, Inc., the guarantors party thereto and Wells Fargo Bank, N.A., as trustee, as further supplemented by the Eighth Supplemental
Indenture, dated as of July 15, 2013, among T Mobile USA, Inc., the guarantors party thereto and Wells Fargo Bank, N.A., as trustee, and as further supplemented by that certain Ninth Supplemental Indenture, dated as of August 11, 2014,
among T-Mobile USA, Inc., the guarantors named therein and Wells Fargo Bank, N.A., as trustee. 

“Series Issue Date Existing Indebtedness” means the Notes of any Series (other than the Notes of
this Series) issued under the Base Indenture and in existence on or being issued on the Series Issue Date (including the DT Notes) (and any “Exchange Notes” (as defined in the Base Indenture) relating thereto) and, in each case, the
related Note Guarantees (other than the Notes issued on the Series Issue Date). 

  
 -8- 

 “Term Loan Credit Agreement” means that certain credit
agreement dated November 9, 2015 by and among the Company, the several lenders party thereto and Deutsche Bank AG New York Branch as administrative agent and collateral agent, as amended by that certain First Incremental Facility Amendment,
dated as of December 29, 2016, by and among Parent, Deutsche Bank AG New York Branch, as administrative agent, the guarantors party thereto and DT, as the initial incremental term loan lender, and that certain Second Incremental Facility
Amendment, dated as of January 25, 2017, by and among Parent, Deutsche Bank, AG New York Branch, as administrative agent, the guarantors party thereto and DT, including any notes, guarantees, collateral documents, instruments and agreements
executed in connection therewith, and, in each case, as amended, restated, modified, renewed, refunded, replaced in any manner (whether upon or after termination or otherwise) or refinanced in whole or in part from time to time. 

“Transactions” means (i) the Merger, (ii) the offering of the Permitted MetroPCS Notes and the DT Notes and the
incurrence of the TMUS Working Capital Facility, (iii) the refinancing of Existing Indebtedness on or prior to the Closing Date, (iv) the “Cash Payment” and the “MetroPCS Reverse Stock Split”, each as defined in the
Business Combination Agreement, and (v) all other transactions consummated in connection therewith. 
 “TMUS Working
Capital Facility” shall have the meaning assigned to such term in the Business Combination Agreement. 

Section 1.02    Other Definitions. 
  

					
	 Additional Notes
	  	 	2.03	 
	 Base Indenture
	  	 	Recitals	 
	 Twenty-Third Supplemental Indenture
	  	 	Preamble	 
	 Series Issue Date
	  	 	Preamble	 

 Section 1.03    Rules of Construction. 

Unless the context otherwise requires: 

(1)    a term has the meaning assigned to it; 

(2)    an accounting term not otherwise defined has the meaning assigned to it in accordance with GAAP;

 (3)    “or” is not exclusive; 

(4)    words in the singular include the plural, and in the plural include the singular; 

(5)    “will” shall be interpreted to express a command; 

  
 -9- 

 (6)    provisions apply to successive events and
transactions; 
 (7)    “including” means “including, without limitation”; and 

(8)    references to sections of or rules under the Securities Act will be deemed to include substitute,
replacement or successor sections or rules adopted by the SEC from time to time. 
 ARTICLE II. 

THE NOTES 

Section 2.01    Creation of the Notes; Designations. 

In accordance with Section 2.01 of the Base Indenture, the Company hereby creates a Series of Notes issued pursuant to the Indenture. The Notes of this
Series shall be known and designated as the “4.000% Senior Notes due 2022” of the Company. The Notes of this Series shall be entitled to the benefits of the Note Guarantee of each Guarantor signatory hereto, or that may hereafter execute a
supplemental indenture in accordance with Section 4.17 of the Base Indenture, each such Note Guarantee to be governed by Article X of the Base Indenture (including without limitation the provisions for release of such Note Guarantee in respect
of the Notes of this Series pursuant to Section 10.04 of the Base Indenture). 
 Section 2.02    Forms
Generally. 
 (a)    General. The Notes of this Series and the Trustee’s certificate of authentication
will be substantially in the form of Exhibit A hereto. The Notes of this Series may have notations, legends or endorsements required by law, stock exchange rule or usage. Each Note of this Series will be dated the date of its authentication. The
Notes of this Series shall be in minimum denominations of $2,000 and integral multiples of $1,000. 
 The terms and provisions contained in the Notes of
this Series will constitute, and are hereby expressly made, a part of this Twenty-Third Supplemental Indenture and the Company, the Guarantors and the Trustee, by their execution and delivery of this Twenty-Third Supplemental Indenture, expressly
agree to such terms and provisions and to be bound thereby. However, to the extent any provision of any such Note conflicts with the express provisions of this Twenty-Third Supplemental Indenture, the provisions of this Twenty-Third Supplemental
Indenture shall govern and be controlling. 
 (b)    Global Notes. Notes of this Series issued in global
form will be substantially in the form of Exhibit A hereto (including the Global Note Legend thereon and the “Schedule of Exchanges of Interests in the Global Note” attached thereto). Notes of this Series issued in definitive form will be
substantially in the form of Exhibit A hereto (but without the Global Note Legend thereon and without the “Schedule of Exchanges of Interests in the Global Note” attached thereto). Each Global Note will represent such of the outstanding
Notes of this Series as will be specified therein and each shall provide that it represents the aggregate principal amount of outstanding Notes of this Series from time to time endorsed thereon and that the aggregate principal amount of outstanding
Notes of this Series represented thereby may from time to time be 

  
 -10- 

 
reduced or increased, as appropriate, to reflect exchanges and redemptions. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the aggregate principal amount of
outstanding Notes of this Series represented thereby will be made by the Trustee or the Notes Custodian, at the direction of the Trustee, in accordance with instructions given by the Holder thereof. 

Section 2.03    Title and Terms of Notes. 

The aggregate principal amount of Notes of this Series which shall be authenticated and delivered on the Series Issue Date under the Indenture shall be
$500,000,000; provided, however, that subject to the Company’s compliance with Section 4.09 of the Base Indenture, the Company from time to time, without giving notice to or seeking the consent of the Holders of Notes of this
Series, may issue additional notes (the “Additional Notes”) in any amount having the same terms as the Notes of this Series in all respects, except for the issue date, the issue price, the initial Interest Payment Date and
rights under a related registration rights agreement, if any. Any such Additional Notes shall be authenticated by the Trustee upon receipt of a Company Order to that effect, and when so authenticated, will constitute “Notes” for all
purposes of the Indenture and will (together with all other Notes of this Series issued under the Indenture) constitute a single Series of Notes under the Indenture; provided that if such Additional Notes are not fungible with the Notes of
this Series for U.S. federal income tax purposes, as applicable, as determined by the Company, such Additional Notes may have a separate CUSIP number. 

(a)    The Notes of this Series issued on the Series Issue Date will be issued at an issue price of 100% of the principal
amount thereof. 
 (b)    The principal amount of the Notes of this Series is due and payable in full on April 15,
2022 unless earlier redeemed. 
 (c)    The Notes of this Series shall bear interest (computed on the basis of a 360-day year comprised of twelve 30-day months) at the rate of 4.000% per annum from and including the Series Issue Date until maturity or early redemption; and interest will
be payable semi-annually in arrears on April 15 and October 15 of each year (each, an “Interest Payment Date”), commencing October 15, 2017, to the Persons in whose name such Notes of this Series were
registered at the close of business on the preceding April 1 or October 1, respectively. 
 (d)    Principal
of and interest on the Notes of this Series shall be payable as set forth in Exhibit A. 
 (e)    Other than as
provided in Article III of this Twenty-Third Supplemental Indenture, the Notes of this Series shall not be redeemable. 

(f)    The Notes of this Series shall not be entitled to the benefit of any mandatory redemption or sinking fund. 

(g)    The Notes of this Series shall not be convertible into any other securities. 

  
 -11- 

 (h)    The Notes of this Series will be unsubordinated debt securities and
will be entitled to unsubordinated Note Guarantees of the Guarantors in accordance with the terms of the Indenture. 

(i)    The Company initially appoints the Trustee as Registrar and Paying Agent with respect to the Notes of this Series
until such time as the Trustee has resigned or a successor has been appointed. 
 (j)    The Notes of this Series will
initially be evidenced by one or more Global Notes issued in the name of Cede & Co., as nominee of The Depository Trust Company. 

(k)    The Company shall pay principal of, premium, if any, and interest on the Notes of this Series in money of the
United States of America that at the time of payment is legal tender for payment of public and private debts. 

(l)    The terms and provisions of Appendix A of the Base Indenture shall apply to the Notes of this Series. 

Section 2.04    Transfer and Exchange. 

The Notes of this Series shall be issued in registered form and shall be transferable only upon the surrender of a Note of this Series for registration of
transfer and in compliance with Appendix A of the Base Indenture. 
 When Notes of this Series are presented to the Registrar or a co-registrar with a request to register a transfer or to exchange them for an equal principal amount of Notes of this Series of other denominations, the Registrar will register the transfer or make the exchange as
requested if its requirements for such transactions are met. To permit registrations of transfers and exchanges, the Company shall execute and the Trustee shall authenticate Notes of this Series at the Registrar’s request. A Holder of Notes of
this Series may transfer or exchange Notes of this Series only in accordance with the Indenture. Upon any transfer or exchange, the Registrar and the Trustee may require a Holder of Notes of this Series, among other things, to furnish appropriate
endorsements or transfer documents. No service charge shall be made for any registration of transfer or exchange (except as otherwise expressly permitted herein), but the Company may require payment of a sum sufficient to cover any transfer tax or
similar governmental charge payable in connection therewith. 
 Prior to due presentment of any Note of this Series for registration of transfer, the
Company, the Trustee, any agent of the Company or the Trustee, the Paying Agent and the Registrar may deem and treat the Person in whose name a Note of this Series is registered as the absolute owner of such Note for all purposes, including for the
purpose of receiving payment of principal of, and any premium and any interest, if any, on such Note and for all other purposes whatsoever, whether or not such Note be overdue, and none of the Company, the Trustee, the Paying Agent or the Registrar
shall be affected by notice to the contrary. 
 Any holder of a beneficial interest in a Global Note of this Series shall, by acceptance of such beneficial
interest, agree that transfers of beneficial interests in such Global Note may be effected only through a book-entry system maintained by (a) the holder of such Global Note (or its agent) or (b) any holder of a beneficial interest in such
Global Note, and that ownership of a beneficial interest in such Global Note shall be required to be reflected in a book entry. 

  
 -12- 

 All Notes of this Series issued upon any transfer or exchange pursuant to the terms of the Indenture shall
evidence the same debt and shall be entitled to the same benefits under the Indenture as such Notes surrendered upon such transfer or exchange. 

ARTICLE III. 
 REDEMPTION AND
PREPAYMENT 
 Section 3.01    Optional Redemption. 

The Notes of this Series may be redeemed, in whole, or from time to time in part, subject to the conditions and at the redemption prices set forth in
Section 5 of the form of Note set forth in Exhibit A hereto, which are hereby incorporated by reference and made part of this Twenty-Third Supplemental Indenture, together with accrued and unpaid interest to, but not including, the redemption
date. 
 Section 3.02    Redemption Procedures. 

The provisions of Article III of the Base Indenture shall apply in the case of a redemption pursuant to this Article III. 

ARTICLE IV. 
 COVENANTS 

With respect to this Series of Notes, Article IV of the Base Indenture shall be amended as follows: 

Section 4.07    Restricted Payments. 

Section 4.07(3) shall be amended by (i) inserting the words “and (16)” after “(15)” and (ii) deleting the
word “and” prior to “(15)” and replacing it with “,”. 
 Section 4.07(3)(G) shall be amended to read as
follows: 
 “(G)    the amount that would be calculated immediately prior to the consummation of the Merger on the
Closing Date pursuant to clause (3) of the second paragraph of Section 4.07(a) of the September 2010 Senior Notes Indenture, as in effect immediately prior to the effectiveness of the December 2012 Sixth Supplemental Indenture (provided
that any calculation of cumulative Consolidated Cash Flow and Consolidated Interest Expense in subclause (A) of such clause (3) shall include (x) the Company’s last fiscal quarter ending prior to the Closing Date, and
(y) the period from the beginning of the Company’s fiscal quarter during which the Closing Date occurs to the Closing Date, in each case, if internal financial statements are available for such period at the time of calculation, even if
they are not available immediately prior to the consummation of the Merger on the Closing Date).” 

  
 -13- 

 Section 4.07(b)(15) of the Base Indenture shall be amended to read as follows: 

“(15)     other Restricted Payments in an aggregate amount since the Closing Date not to exceed the greater of
$375.0 million or (y) 6.0% of the Consolidated Cash Flow of the Company; and”. 
 A new Section 4.07(b)(16) shall be included and
shall read as follows: 
 “(16)    any Restricted Payment; provided that the Debt to Cash Flow Ratio
calculated on a pro forma basis in the manner described in the definition of “Debt to Cash Flow Ratio” after giving effect to such Restricted Payment would be equal to or less than 3.00 to 1.00.”. 

Section 4.08    Dividend and Other Payment Restrictions Affecting Subsidiaries. 

The provisions of Section 4.08(b)(3) of the Base Indenture shall be amended to read as follows: 

“(3)    Series Issue Date Existing Indebtedness, the Notes issued on the Series Issue Date, and any Additional Notes
of the same Series, the Note Guarantees in respect thereof, and the Base Indenture, as supplemented by the Twenty-Third Supplemental Indenture;”. 

Section 4.09    Incurrence of Indebtedness and Issuance of Preferred Stock.

 Section 4.09(b)(1) of the Base Indenture shall be amended to read as follows: 

“(1)    the incurrence by the Company and any Subsidiary Guarantor of (a) additional Indebtedness under Credit
Facilities, provided that giving effect to such incurrence, the aggregate principal amount (with letters of credit being deemed to have a principal amount equal to the maximum potential liability of the Company and its Restricted Subsidiaries
thereunder) of all Indebtedness under Credit Facilities then outstanding under this paragraph (1), together with any Indebtedness incurred pursuant to the following clause (b), does not exceed the greater of (x) $9.0 billion and (y) an
amount such that, upon the incurrence of Indebtedness under this clause (1), the Secured Debt to Cash Flow Ratio of the Company and its Subsidiaries for the most recently ended four full fiscal quarters for which financial statements are available,
calculated on a pro forma basis in the manner described in the definition of “Secured Debt to Cash Flow Ratio,” shall not exceed 2.00:1.00; provided that for purposes of determining the amount of Indebtedness that may be incurred
under this clause (a)(y), all Indebtedness incurred under this clause (1) shall be treated as Consolidated Indebtedness that is secured by a Lien and (b) without duplication, all Indebtedness incurred to renew, refund, refinance, replace,
defease or discharge any Indebtedness incurred pursuant to the foregoing clause (a); provided, however, that the maximum amount permitted under this clause (1) shall not be deemed to limit additional Indebtedness under the Credit
Facilities to the extent that the incurrence of such additional Indebtedness is permitted pursuant to any of the other provisions of this covenant;” 

Section 4.09(b)(2) of the Base Indenture shall be amended to read as follows: 

“(2)    the incurrence by the Company and its Restricted Subsidiaries of any Existing Indebtedness or any Series Issue
Date Existing Indebtedness;”. 

  
 -14- 

 Section 4.09(b)(3) of the Base Indenture shall be amended to read as follows: 

“(3)    the incurrence by the Company and the Subsidiary Guarantors of Indebtedness represented by (i) the Notes
to be issued on the date of the Twenty-Third Supplemental Indenture and the related Note Guarantees, (ii) the 2025 Notes and the related note guarantees and (iii) the 2027 Notes and the related note guarantees;”. 

Section 4.09(b)(11) of the Base Indenture shall be amended to read as follows: 

“(11)    the incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness arising from (a) the
honoring by a bank or other financial institution of a check, draft or similar instrument drawn against insufficient funds, so long as such Indebtedness is covered within five Business Days of notice to the Company or any of its Restricted
Subsidiaries, (b) in respect of netting, overdraft protection and other arrangement arising under standard business terms of any bank at which the Company or any Restricted Subsidiary maintains an overdraft, cash pooling or other similar
facility or arrangement or (c) in respect of the financing of insurance premiums in the ordinary course of business, provided that the aggregate principal amount of Indebtedness incurred pursuant to clauses (11)(b) and (c) shall
not, at any time outstanding, exceed the greater of (×) $250.0 million and (y) 5.0% of the Consolidated Cash Flow of the Company as of the time of such incurrence;” 

Section 4.09(b)(13) of the Base Indenture shall be amended to read as follows: 

“(13)    Incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness for relocation or clearing
obligations relating to the Company’s or any of its Restricted Subsidiary’s FCC Licenses in an aggregate principal amount (or accreted value, as applicable), including all Permitted Refinancing Indebtedness incurred to renew, refund,
refinance, replace, defease or discharge any Indebtedness incurred pursuant to this clause (13), at any time outstanding not to exceed the greater of (x) $400.0 million and (y) 1.0% of the Company’s Total Assets as of the time of such
incurrence;” 
 Section 4.09(b)(18) of the Base Indenture shall be amended to read as follows: 

“(18)    the incurrence by the Company or any Restricted Subsidiary of Indebtedness to the extent that the net
proceeds thereof are promptly deposited to defease or to satisfy and discharge the Notes of this Series;”. 
 Section 4.09(b)(25) of
the Base Indenture shall be amended to read as follows: 
 “(25)    the incurrence by Restricted Subsidiaries that
are not Guarantors of Indebtedness; provided, however, that the aggregate principal amount (or accreted value, as applicable) of all Indebtedness incurred under this clause (25), when aggregated with the principal amount (or accreted
value) of all other Indebtedness then outstanding and incurred pursuant to this clause (25), including all Permitted Refinancing Indebtedness incurred to renew, refund, refinance, replace, defease or discharge any Indebtedness incurred pursuant to
this clause (25), does not exceed the greater of (x) $250.0 million and (y) 5.0% of the Consolidated Cash Flow of the Company and its Subsidiaries for the most recently ended four full fiscal quarters for which financial statements are
available.” 

  
 -15- 

 Section 4.11    Transactions with Affiliates. 

Section 4.11(b)(8) of the Base Indenture shall be amended to read as follows: 

“(8)    transactions with customers, clients, suppliers, purchasers, sellers of goods or services, or licensees of
intellectual property, in each case in the ordinary course of business and otherwise in compliance with the terms of the indenture, provided that in the good faith determination of the Company’s Board of Directors or a senior financial
officer of the Company, which determination shall be conclusive, such transactions are on terms, taken as a whole, not materially less favorable to the Company or the applicable Restricted Subsidiary than those that could reasonably be expected to
be obtained in a comparable transaction at such time on an arm’s length basis from a Person that is not an Affiliate of the Company;” 

Section 4.11(b)(9) of the Base Indenture shall be amended to read as follows: 

“(9)    issuances, exchanges, purchases or repurchases of notes or other Indebtedness of the Company or its Restricted
Subsidiaries or solicitations of amendments, waivers or consents in respect of notes or such other Indebtedness, if such issuance, exchange, purchase, repurchase or solicitation is approved by a majority of the disinterested members of the Board of
Directors of the Company;” 
 Section 4.11(b) of the Base Indenture shall be amended by (i) inserting the word “and”
after the semicolon at the end of clause (11); (ii) deleting “; and” at the end of clause (12) and replacing it with a period and (iii) deleting clause (13). 

Section 4.17    Additional Note Guarantees. 

Section 4.17 of the Base Indenture shall be amended and restated in its entirety as follows: 

“If (a) the Company or any of the Company’s Domestic Restricted Subsidiaries acquires or creates another Domestic Restricted
Subsidiary (and such Subsidiary is a Wholly-Owned Subsidiary and is neither a Designated Tower Entity, the Reinsurance Entity nor an Immaterial Subsidiary) after the Series Issue Date or (b) any Restricted Subsidiary of the Company guarantees
any Specified Issuer Indebtedness of the Company after the Series Issue Date or (c) Parent or any Subsidiary of Parent acquires or creates a Subsidiary that directly or indirectly owns Equity Interests of the Company, then the Company or
Parent, as applicable, will cause that newly acquired or created Domestic Restricted Subsidiary, Restricted Subsidiary or Subsidiary of Parent to become a Guarantor of the Notes of this Series and execute a supplemental indenture and, if requested
by the Trustee, deliver an Opinion of Counsel reasonably satisfactory to the Trustee within 10 Business Days after the date on which it was acquired or created or guarantees such Specified Issuer Indebtedness, as applicable, or reasonably promptly
thereafter.” 
 Section 4.19    Changes in Covenants When Notes Rated
Investment Grade. 
 The first clause of the first sentence of Section 4.19 shall be amended to replace the words
“Closing Date” with the words “Series Issue Date”. 

  
 -16- 

 ARTICLE V. 

MISCELLANEOUS 

Section 5.01    Effect of Twenty-Third Supplemental Indenture. 

(a)    This Twenty-Third Supplemental Indenture is a supplemental indenture within the meaning of Section 2.02 of the
Base Indenture, and the Base Indenture shall (notwithstanding Section 12.12 thereof or Section 5.04 hereof) be read together with this Twenty-Third Supplemental Indenture and shall have the same effect over the Notes of this Series, in the
same manner as if the provisions of the Base Indenture and this Twenty-Third Supplemental Indenture were contained in the same instrument. 

(b)    In all other respects, the Base Indenture is confirmed by the parties hereto as supplemented by the terms of this
Twenty-Third Supplemental Indenture. 
 Section 5.02    Governing Law. 

THE INDENTURE AND THE NOTES OF THIS SERIES WILL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. 

Section 5.03    Waiver of Jury Trial. 

EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION
DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS TWENTY-THIRD SUPPLEMENTAL INDENTURE. 

Section 5.04    No Adverse Interpretation of Other Agreements. 

Subject to Section 5.01, this Twenty-Third Supplemental Indenture may not be used to interpret any other indenture, loan or debt agreement of the Company
or its Subsidiaries or of any other Person. Subject to Section 5.01, any such other indenture, loan or debt agreement may not be used to interpret this Twenty-Third Supplemental Indenture. 

Section 5.05    Successors. 
 All
agreements of the Company in this Twenty-Third Supplemental Indenture and the Notes of this Series will bind its successors. All agreements of the Trustee in this Twenty-Third Supplemental Indenture will bind its successors. All agreements of each
Guarantor in this Twenty-Third Supplemental Indenture will bind its successors, except as otherwise provided in Section 10.04 of the Base Indenture. 

Section 5.06    Severability. 

In case any provision in this Twenty-Third Supplemental Indenture or in the Notes of this Series is invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions will not in any way be affected or impaired thereby. 

  
 -17- 

 Section 5.07    Counterparts. 

This Twenty-Third Supplemental Indenture may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when
so executed will be deemed to be an original and all of which taken together will constitute one and the same agreement. The exchange of copies of this Twenty-Third Supplemental Indenture and of signature pages by facsimile or PDF transmission shall
constitute effective execution and delivery of this Twenty-Third Supplemental Indenture as to the parties hereto and may be used in lieu of the original Twenty-Third Supplemental Indenture for all purposes. Signatures of the parties hereto
transmitted by facsimile or PDF transmission shall be deemed to be their original signatures for all purposes. 

Section 5.08    Table of Contents, Headings, etc. 

The Table of Contents and headings of the Articles and Sections of this Twenty-Third Supplemental Indenture have been inserted for convenience of reference
only, are not to be considered a part of this Twenty-Third Supplemental Indenture and will in no way modify or restrict any of the terms or provisions hereof. 

Section 5.09    Beneficiaries of this Twenty-Third Supplemental Indenture. 

Nothing in this Twenty-Third Supplemental Indenture or in the Notes of this Series, expressed or implied, shall give to any Person, other than the parties
hereto and their successors hereunder, and the Holders of the Notes of this Series, any benefit or any legal or equitable right, remedy or claim under this Twenty-Third Supplemental Indenture. 

Section 5.10    No Personal Liability of Directors, Officers, Employees and
Stockholders. 
 No past, present or future director, officer, member, manager, partner, employee, incorporator or stockholder of the Company or any
Guarantor, as such, will have any liability for any obligations of the Company or the Guarantors under the Notes of this Series, this Twenty-Third Supplemental Indenture, the Note Guarantees, or for any claim based on, in respect of, or by reason
of, such obligations or their creation. Each Holder of the Notes of this Series by accepting a Note of this Series waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes of this Series.

 Section 5.11    The Trustee. 

The Trustee shall not be responsible or liable for the validity or sufficiency of, or the recitals in, this Twenty-Third Supplemental Indenture and all of the
provisions contained in the Base Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee and the Agents shall be applicable in respect of the Notes of this Series and of this Twenty-Third Supplemental Indenture
as fully and with like effect as set forth in full herein. 

  
 -18- 

 ARTICLE VI. 

DEFAULTS AND REMEDIES 
 With
respect to this Series of Notes, Article VI of the Base Indenture shall be amended as follows: 
 Section 6.01    Events
of Default. 
 Section 6.01(1) shall be amended to delete the words “(including Additional Interest, if any)”.

 ARTICLE VII. 
 [RESERVED] 

ARTICLE VIII. 
 [RESERVED] 

ARTICLE IX. 
 [RESERVED] 

ARTICLE X. 
 [RESERVED] 

[Signatures on following page] 

  
 -19- 

 IN WITNESS WHEREOF, the parties hereto have caused this Twenty-Third Supplemental Indenture to be duly executed,
all as of the date first written above. 
  

			
	T-MOBILE USA, INC.
		
	By:	 	 /s/ J. Braxton Carter

	Name:	 	J. Braxton Carter
	Title:	 	Executive Vice President and Chief Financial Officer

 [Signature page to Twenty-Third Supplemental Indenture] 

  

					
		 	GUARANTORS:
		
		 	IBSV LLC
		 	METROPCS CALIFORNIA, LLC
		 	METROPCS FLORIDA, LLC
		 	METROPCS GEORGIA, LLC
		 	METROPCS MASSACHUSETTS, LLC
		 	METROPCS MICHIGAN, LLC
		 	METROPCS NETWORKS CALIFORNIA, LLC
		 	METROPCS NETWORKS FLORIDA, LLC
		 	METROPCS NEVADA, LLC
		 	METROPCS NEW YORK, LLC
		 	METROPCS PENNSYLVANIA, LLC
		 	METROPCS TEXAS, LLC
		 	POWERTEL MEMPHIS LICENSES, INC.
		 	POWERTEL/MEMPHIS, INC.
		 	SUNCOM WIRELESS HOLDINGS, INC.
		 	SUNCOM WIRELESS INVESTMENT COMPANY, LLC
		 	SUNCOM WIRELESS LICENSE COMPANY, LLC
		 	SUNCOM WIRELESS MANAGEMENT COMPANY, INC.
		 	SUNCOM WIRELESS OPERATING COMPANY, L.L.C.
		 	SUNCOM WIRELESS PROPERTY COMPANY, L.L.C.
		 	SUNCOM WIRELESS, INC.
		 	T-MOBILE CENTRAL LLC
		 	T-MOBILE FINANCIAL LLC
		 	T-MOBILE LEASING LLC
		 	T-MOBILE LICENSE LLC
		 	T-MOBILE NORTHEAST LLC
		 	T-MOBILE PCS HOLDINGS LLC
		 	T-MOBILE PUERTO RICO HOLDINGS LLC
		 	T-MOBILE PUERTO RICO LLC
		 	T-MOBILE RESOURCES CORPORATION
		 	T-MOBILE SOUTH LLC
		 	T-MOBILE SUBSIDIARY IV CORPORATION
		 	T-MOBILE US, INC.
		 	T-MOBILE WEST LLC
		 	TRITON PCS FINANCE COMPANY, INC.
		 	TRITON PCS HOLDINGS COMPANY L.L.C.
		 	VOICESTREAM PCS I IOWA CORPORATION
		 	VOICESTREAM PITTSBURGH LLC
			
		 	By:	 	 /s/ J. Braxton Carter

		 	Name:	 	J. Braxton Carter
		 	Title:	 	Executive Vice President and Chief Financial Officer

  
 [Signature page to
Twenty-Third Supplemental Indenture] 

 
			
	DEUTSCHE BANK TRUST COMPANY AMERICAS, as Trustee
		
	By:	 	 /s/ Carol Ng

	Name:	 	Carol Ng
	Title:	 	Vice President
		
	By:	 	 /s/ Randy Kahn

	Name:	 	Randy Kahn
	Title:	 	Vice President

  
 [Signature page to
Twenty-Third Supplemental Indenture] 

 EXHIBIT A 

[Form of Face of Initial Note] 

[Global Notes Legend] 
 UNLESS
THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 

TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH
SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE TWENTY-THIRD SUPPLEMENTAL INDENTURE REFERRED TO ON THE REVERSE HEREOF. 

[Definitive Notes Legend] 
 IN
CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

  
 Exhibit A-1 

 [CUSIP] 

[ISIN] 
 4.000% Senior Notes due
2022 
  

					
	 No.             
	  	$	                                  
  	 

 T-MOBILE USA, INC. 

promises to pay to
                             or registered assigns, 

the principal sum of
                             DOLLARS on April 15, 2022. 

Interest Payment Dates: April 15 and October 15. 
 Record
Dates: April 1 and October 1. 

  
 Exhibit A-2 

 Dated:             , 2017 

 

			
	T-MOBILE USA, INC.
		
	By:	 	  

	Name:	 	
	Title:	 	

  
 Exhibit A-3 

			
	This is one of the Notes referred to in the within-mentioned Indenture:
	
	DEUTSCHE BANK TRUST COMPANY AMERICAS, as Trustee
		
	By:	 	  

		 	Authorized Signatory

  
 Exhibit A-4 

 [Form of Reverse Side of Initial Note] 

4.000% Senior Notes due 2022 (the “Notes”) 

Capitalized terms used herein have the meanings assigned to them in the Indenture referred to below unless otherwise indicated. 

(1)    INTEREST. Interest (computed on the basis of a 360-day year comprised of twelve 30-day months) shall accrue on the principal amount of this Note from and including March 16, 2017 until maturity at a rate per annum equal to 4.000%. 

The Company promises to pay interest semi-annually in arrears on April 15 and October 15 of each year, or if any such day is not a Business Day, on
the next succeeding Business Day (each, an “Interest Payment Date”). Interest on the Notes will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from the date of
issuance; provided that if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue
from such next succeeding Interest Payment Date; provided further that the first Interest Payment Date shall be October 15, 2017. If an Interest Payment Date or the maturity date falls on a day that is not a Business Day, the
related payment of principal or interest will be made on the next succeeding Business Day as if made on the date the payment was due, and no interest shall accrue for the intervening period. 

(2)    METHOD OF PAYMENT. The Company will pay interest on the Notes (except defaulted interest) to the Persons who
are registered Holders of Notes at the close of business on the April 1 or October 1 next preceding the Interest Payment Date, even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as
provided in Section 2.14 of the Base Indenture with respect to defaulted interest. The Notes will be payable as to principal, premium, if any, and interest at the office or agency of the Company maintained for such purpose within the City and
State of New York, or, at the option of the Company, payment of interest may be made by check mailed to the Holders at their addresses set forth in the books and records of the Registrar; provided that payment by wire transfer of immediately
available funds will be required with respect to principal of and interest and premium, if any, on, all Global Notes and all other Notes the Holders of which will have provided wire transfer instructions to the Company or the Paying Agent. Such
payment will be in such money of the United States of America as at the time of payment is legal tender for payment of public and private debts. The Holder of a Definitive Note is not required to surrender such Definitive Note to the Trustee in
order to receive payment of principal at maturity. Such Definitive Note, after payment has been made, shall be cancelled without the requirement of presentation. 

(3)    PAYING AGENT AND REGISTRAR. Initially, Deutsche Bank Trust Company Americas, the Trustee under the
Indenture, will act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity. 

(4)    INDENTURE. The Company issued the Notes pursuant to an Indenture dated as of April 28, 2013 (the “Base
Indenture”) among the Company, the Guarantors and the Trustee, as amended and supplemented with respect to the Notes by the Twenty-Third Supplemental Indenture dated as 

  
 Exhibit A-5 

 
of March 16, 2017 (the “Twenty-Third Supplemental Indenture”; the Base Indenture, as supplemented by the Eleventh Supplemental Indenture, dated as of
May 1, 2013 by and among the Company, the guarantors party thereto and the Trustee, the Sixteenth Supplemental Indenture, dated as of August 11, 2014 by and among the Company, the guarantors party thereto and the Trustee, the Nineteenth
Supplemental Indenture, dated as of September 28, 2015, by and among the Company, the guarantors party thereto and the Trustee, and the Twenty-Second Supplemental Indenture, dated as of August 30, 2016, by and among the Company, the
guarantors party thereto and the Trustee, and as amended and supplemented in respect of the Notes by the Twenty-Third Supplemental Indenture, the “Indenture”). The terms of the Notes include those stated in the Indenture and those
made part of the Indenture by reference to the TIA. The Notes are subject to all such terms, and Holders are referred to the Indenture and, to the extent so included in the Indenture, to the TIA for a statement of such terms. To the extent any
provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. The Notes are unsecured, unsubordinated obligations of the Company. The Indenture does not limit the
aggregate principal amount of Notes that may be issued thereunder. 
 (5)    OPTIONAL REDEMPTION. 

On or after March 16, 2022, the Company may redeem all or a part of the Notes upon not less than 10 nor more than 60 days’ notice, at
a redemption price equal to 100% of the principal amount of the Notes redeemed plus accrued and unpaid interest to, but not including, the date of redemption, subject to the rights of Holders of Notes on the relevant record date to receive interest
due on the relevant Interest Payment Date for periods prior to such redemption date. 
 Unless the Company defaults in the payment of the
redemption price, interest will cease to accrue on the Notes or portions thereof called for redemption on the applicable redemption date. 

At any time prior to March 16, 2022, the Company may also redeem all or a part of the Notes, upon not less than 10 nor more than 60
days’ notice, at a redemption price equal to 100% of the principal amount of Notes redeemed plus the Applicable Premium as of, and accrued and unpaid interest to, but not including, the date of redemption, subject to the rights of Holders of
Notes on the relevant record date to receive interest due on the relevant interest payment date for periods prior to such date of redemption. 

“Applicable Premium” means, as calculated by the Company and provided to the Trustee, with respect to any Note on any redemption date,
the greater of: 
 (1)    1.0% of the principal amount of the Note; or 

(2)    the excess of: 

(a)    the present value at such redemption date of (i) the redemption price of the Note at
March 16, 2022 (such redemption price being set forth in the table appearing above under Section 5(a) hereof, plus (ii) all required interest payments due on the Note through March 16, 2022 (excluding accrued but unpaid interest to
the redemption date), computed using a discount rate equal to the Treasury Rate as of such redemption date plus 50 basis points; over 

  
 Exhibit A-6 

 (b)    the principal amount of the Note, if greater. 

“Treasury Rate” means, with respect to any redemption date, the yield to maturity of United States Treasury securities with a constant
maturity (as compiled and published in the most recent Federal Reserve Statistical Release H.15 (519) that has become publicly available at least two business days prior to the redemption date (or, if such Statistical Release is no longer published,
any publicly available source of similar market data)) most nearly equal to the period from the redemption date to March 16, 2022; provided, however, that if the period from the redemption date to March 16, 2022 is less than
one year, the weekly average yield on actually traded United States Treasury securities adjusted to a constant maturity of one year will be used. The Company will (1) calculate the Treasury Rate on the third business day preceding the
applicable redemption date and (2) prior to such redemption date file with the trustee an officer’s certificate setting forth the Applicable Premium and the Treasury Rate and showing the calculation of each in reasonable detail. 

(6)    MANDATORY REDEMPTION. 

The Company is not required to make mandatory redemption or sinking fund payments with respect to the Notes. 

(7)    REPURCHASE AT THE OPTION OF HOLDER. 

(a)    If there is a Change of Control Triggering Event, the Company will be required to make a Change of Control Offer to
each Holder to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of such Holder’s Notes at a purchase price in cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest on the Notes repurchased to, but not including, the date of purchase, subject to the rights of Holders on the relevant record date to receive interest due on the relevant Interest Payment Date for periods prior to such repurchase
date pursuant to Section 4.15 of the Base Indenture. Within 30 days following any Change of Control Triggering Event, the Company will send a notice to each Holder and the Trustee describing the transaction or transactions and identify the
ratings decline that together constitute the Change of Control Triggering Event, offering to repurchase Notes on the Change of Control Payment Date specified in the notice, which date will be no earlier than 10 days and no later than 60 days from
the date such notice is sent and setting forth the procedures governing the Change of Control Offer as required by the Indenture. 

(b)    If the Company or a Restricted Subsidiary of the Company consummates any Asset Sales, within twenty days of each
date on which the aggregate amount of Excess Proceeds exceeds $100.0 million, the Company shall apply the entire aggregate amount of unutilized Excess Proceeds (not only the amount in excess of $100.0 million) to make an Asset Sale Offer
pursuant to Section 4.10 of the Base Indenture to all Holders of Notes and all holders of other Indebtedness that is pari passu with the Notes containing provisions similar to those set forth in the Indenture with respect to
offers to purchase or redeem with the proceeds of sales of assets to purchase the maximum principal amount of Notes (including any Additional Notes) and purchase or redeem such other pari passu Indebtedness that may be purchased or
redeemed out of the Excess Proceeds at an offer price in cash in an amount equal to 100% of the principal amount of the Notes and such other pari passu Indebtedness that may be purchased or redeemed with Excess Proceeds thereof

  
 Exhibit A-7 

 
plus accrued and unpaid interest thereon to, but not including, the date of consummation of the purchase, in accordance with the procedures set forth in the Indenture. To the extent that the
aggregate amount of Notes (including any Additional Notes) and other pari passu Indebtedness tendered pursuant to an Asset Sale Offer is less than the Excess Proceeds, the Company (or such Restricted Subsidiary) may use those Excess
Proceeds for any purpose not otherwise prohibited by the Indenture. If the aggregate principal amount of Notes and other pari passu Indebtedness tendered in response to such Asset Sale Offer exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and the Company shall select such other pari passu Indebtedness to be purchased or redeemed on a pro rata basis unless otherwise required by law or applicable stock exchange or depositary
requirements. Holders of Notes that are the subject of an offer to purchase will receive an Asset Sale Offer from the Company prior to any related purchase date and may elect to have such Notes purchased by completing the form entitled “Option
of Holder to Elect Purchase” attached to the Notes. 
 (8)    NOTICE OF REDEMPTION. Notice of redemption will
be sent at least 30 days but not more than 60 days before the redemption date to each Holder whose Notes are to be redeemed, except that redemption notices may be sent or mailed more than 60 days prior to a redemption date if the notice is issued in
connection with a defeasance of the Notes or a satisfaction and discharge of the Indenture. Notes in denominations larger than $2,000 may be redeemed in part but only in whole multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed. In connection with any redemption of Notes, any such redemption or notice may, at the Company’s discretion, be subject to one or more conditions precedent. In addition, if such redemption or notice is subject to satisfaction of one or
more conditions precedent, such notice shall state that, in the Company’s discretion, the redemption date may be delayed until such time as any or all such conditions shall be satisfied (or waived by the Company in its sole discretion), or such
redemption may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied (or waived by the Company in its sole discretion) by the redemption date (whether the original redemption date or
the redemption date so delayed). 
 (9)    DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in minimum denominations of $2,000 and integral multiples of $1,000. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other
things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer or exchange of
any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of any Notes (i) for a period beginning at the opening of
business 15 days immediately preceding the sending of notice of redemption of Notes selected for redemption and ending at the close of business on the day such notice is sent or (ii) during the period between a record date and the corresponding
Interest Payment Date. 
 (10)    PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated as its
owner for all purposes. 

  
 Exhibit A-8 

 (11)    AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain
exceptions, the Indenture or the Notes or the Note Guarantees may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes including Additional Notes, if any,
voting as a single class, and any existing Default or Event or Default or compliance with any provision of the Indenture or the Notes or the Note Guarantees may be waived with the consent of the Holders of a majority in aggregate principal amount of
the then outstanding Notes including Additional Notes, if any, voting as a single class. Without the consent of any Holder, the Company, the Guarantors and the Trustee may amend and supplement the Indenture as provided in the Base Indenture. 

(12)    DEFAULTS AND REMEDIES. If an Event of Default occurs (other than an Event of Default relating to certain
events of bankruptcy, insolvency or reorganization of the Company, any Restricted Subsidiary that is a Significant Subsidiary or any group of Restricted Subsidiaries that, taken together, would constitute a Significant Subsidiary) and is continuing,
the Trustee or the Holders of at least 25% in principal amount of the outstanding Notes, in each case, by notice to the Company, may declare the principal of, premium, if any, and accrued but unpaid interest on all the Notes to be due and payable.
If an Event of Default relating to certain events of bankruptcy, insolvency or reorganization of the Company, any Restricted Subsidiary that is a Significant Subsidiary or any group of Restricted Subsidiaries that, taken together, would constitute a
Significant Subsidiary occurs, the principal of, premium, if any, and interest on all the Notes shall become immediately due and payable without any declaration or other act on the part of the Trustee or any Holders. Under certain circumstances, the
Holders of a majority in principal amount of the outstanding Notes may rescind any such acceleration with respect to the Notes and its consequences. 

(13)    TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or any other capacity, may become the
owner or pledgee of Notes and may otherwise deal with the Company or any Affiliate of the Company with the same rights it would have if it were not Trustee. 

(14)    NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, member, manager, partner,
employee, incorporator or stockholder of the Company or any Guarantor, as such, will have any liability for any obligations of the Company or the Guarantors under the Notes, the Indenture, the Note Guarantees or for any claim based on, in respect
of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. 

(15)    AUTHENTICATION. This Note will not be valid until authenticated by the manual or facsimile signature of the Trustee or an
authenticating agent. 
 (16)    ABBREVIATIONS. Customary abbreviations may be used in the name of a Holder or an assignee, such
as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). 

(17)    CUSIP NUMBERS. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification
Procedures, the Company has caused CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers in notices of redemption as a convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on
the Notes or as contained in any notice of redemption, and reliance may be placed only on the other identification numbers placed thereon. 

  
 Exhibit A-9 

 (18)    GOVERNING LAW. THIS NOTE WILL BE GOVERNED BY THE LAWS OF THE STATE OF
NEW YORK. 
 The Company will furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to: 

T-Mobile USA, Inc. 

12920 SE 38th Street 
 Bellevue, Washington 98006 

Attention: General Counsel 
 Fax: (425) 383-7040 

  
 Exhibit A-10 

 ASSIGNMENT FORM 

To assign this Note, fill in the form below: 
  

			
	(I) or (we) assign and transfer this Note to:	 	  

		 	(Insert assignee’s legal name)
	  

	(Insert assignee’s soc. sec. or tax I.D. no.)
	  

	  

	  

	  

 (Print or type assignee’s name, address and zip code) 

and irrevocably appoint
                         to transfer this Note on the books of the Company. The agent may substitute another to act for him. 

Date:
                                         
    
 Your Signature:
                                     

(Sign exactly as your name appears on the face of this Note) 

Signature Guarantee*:
                             
  

	*	Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 

  
 Exhibit A-11 

 OPTION OF HOLDER TO ELECT PURCHASE 

If you want to elect to have this Note purchased by the Company pursuant to Section 4.10 or Section 4.15 of the Base Indenture, check the
appropriate box below: 
 ☐
Section 4.10                     ☐ Section 4.15 

If you want to elect to have only part of the Note purchased by the Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased: 

            $           
      
 Date:
                                         
                
 Your Signature:
                                         

(Sign exactly as your name appears on the face of this Note) 

Tax Identification No.:
                                 

Signature Guarantee*:
                                 

 

	*	Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 

  
 Exhibit A-12 

 SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE* 

The following exchanges of a part of this Global Note for an interest in another Global Note or for a Definitive Note, or exchanges of a part of another Global
Note or Definitive Note for an interest in this Global Note, have been made: 
  

									
	 Date of

Exchange
	 	 Amount of

decrease in

Principal
 Amount of
this
 Global Note
	 	 Amount of

increase in

Principal
 Amount of
this
 Global Note
	  	 Principal

Amount of this
 Global
Note
 following such

decrease

(or increase)
	  	 Signature of

authorized
 officer
of
 Trustee or

Notes Custodian

		 		 		  		  	
		 		 		  		  	
		 		 		  		  	
		 		 		  		  	

  

	*	This schedule should be included only if the Note is issued in global form. 

  
 Exhibit A-13

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