Records for Service Revenues, Net Cash Provided by Operating Activities and Free Cash Flow with Strong Net Income of $550 Million, and Record Q3 Adjusted EBITDA of $2.8 Billion

Strong Financial Performance ( all percentages year-over-year ): ?

• Record service revenues of $7.6 billion, up 7% - expect to lead industry in growth for 14th quarter in a row
• $10.0 billion total revenues, up 8% - expect to lead the industry in growth for 17th time in last 18 quarters
• Strong net income of $550 million, up 50%. Diluted earnings per share ("EPS") of $0.63, up 50%
• Record Q3 $2.8 billion Adjusted EBITDA, up 5%⁽¹⁾ . Adjusted EBITDA excluding spectrum gains up 12%
• Record net cash provided by operating activities of $2.4 billion, up 36%
• Record free cash flow of $921 million, up 59%⁽¹⁾

Customer Growth Expected to Lead the Industry:

• 1.3 million total net additions - 18 straight quarters of adding more than 1 million
• 595,000 branded postpaid phone net additions - expect to lead the industry for the 15th consecutive quarter
• 226,000 branded prepaid net additions - led by the success of MetroPCS
• 1.23% postpaid phone churn - down 9 bps YoY

Strong Network and Distribution Expansion:

• 15 quarters in a row with the fastest download and upload speeds - widening the gap versus the competition
• 600 MHz deployment underway, more than 1.2 million sq mi to be clear in 2017, first sites lit up in Q3, first handset hit the market in October with another device expected to be ready for the 2017 Holiday season
• 3,000 total new stores planned for 2017, with 1,200 new T-Mobile and 1,300 net new MetroPCS stores opened year-to-date

Continued strong outlook for 2017:

• Raising and narrowing guidance range for branded postpaid net customer additions to 3.3 - 3.6 million from 3.0 - 3.6 million
• Net income is not available on a forward looking basis⁽²⁾
• Raising and narrowing Adjusted EBITDA target for the second time this year to $10.8 - $11.0 billion from $10.5 - $10.9 billion, which includes unchanged guidance on leasing revenues of $0.85 - $0.95 billion⁽¹⁾
• Maintaining guidance of $4.8 - $5.1 billion of cash purchases of property and equipment, excluding capitalized interest; expect to be at the high end of our guidance range

• Three-year compound annual growth rates (CAGRs) for net cash provided by operating activities and free cash flow from FY 2016 to FY 2019 remain unchanged at 15% - 18% and 45% - 48%, respectively⁽¹⁾

• Adjusted EBITDA is a non-GAAP financial measure and Free Cash Flow is a non-GAAP financial metric. These non-GAAP financial items should be considered in addition to, but not as a substitute for, the information provided in accordance with GAAP. Reconciliations for these non-GAAP financial items to the most directly comparable GAAP financial items are provided in the financial tables on pages 7 - 10.

• T-Mobile is not able to forecast net income on a forward looking basis without unreasonable efforts due to the high variability and difficulty in predicting certain items that affect GAAP net income including, but not limited to, income tax expense, stock based compensation expense and interest expense. Adjusted EBITDA should not be used to predict net income as the difference between the two measures is variable.

BELLEVUE, Wash. - October 23, 2017 - T-Mobile US, Inc. (NASDAQ: TMUS) reported record financial results in the third quarter of 2017 with best-ever service revenues, net cash provided by operating activities and free cash flow. The Un-carrier also posted strong net income and record Q3 Adjusted EBITDA. These results demonstrate our ability to translate customer growth into financial growth as we continue to generate momentum. In Q3, we delivered strong customer results across the board including 1.3 million total net customer additions. That marks 18 consecutive quarters that T-Mobile has added more than 1 million total customers and we expect to continue leading the industry in postpaid phone growth again in Q3. As a result of this continued strong performance, we are raising our guidance for 2017 - again.

Customers are continuing to choose T-Mobile over the competition because they get more value for their hard-earned dollar. Q3 was no different as we unveiled our latest industry changing move: Netflix on Us. The carriers focus on pushing bigger, fatter, pricier packages of content and services on their customers, while T-Mobile partnered with Netflix to give customers what they want - at no extra cost. In addition, customers are finding out that America’s Best Unlimited Network just keeps getting better. We continue to expand the depth and breadth of our network, and started rolling out 600 MHz spectrum in Q3 well ahead of schedule. The network expansion has enabled our distribution expansion, which is progressing ahead of schedule, and will bring real competition to every corner of the U.S. and sets T-Mobile up for more growth in the future.

"Just step back and look at these financial results - they’re incredible! Record service revenues, record free cash flow, record Q3 Adjusted EBITDA - and that’s on top of 18 quarters in a row with more than one million customers added," said John Legere, President and CEO of T-Mobile. "We’re delivering results that no one else can match and have proven time and time again that we know how to fight for customers and win for shareholders. We won’t stop!"

Strong Financial Performance

Our strong financial performance in Q3 2017 continues to prove T-Mobile's Un-carrier strategy is a winning formula.

• The amortized imputed discount on EIP receivables previously recognized as Interest income has been retrospectively reclassified as Other revenues. The effects of this change in accounting principle are provided in the financial tables. • Total service revenues increased 7% year-over-year in Q3 2017 to $7.6 billion which is expected to mark the 14th quarter in a row that T-Mobile has led the industry in year-over-year service revenue percentage growth. The negative impact from hurricanes was $31 million in Q3 2017.

• Total revenues increased 8% in Q3 2017 to $10.0 billion which is expected to mark the 17th time in the last 18 quarters that T-Mobile has led the industry in total revenue percentage growth year-over-year. The negative impact from hurricanes was $39 million in Q3 2017.

• Branded postpaid phone Average Revenue per User (ARPU) was $46.93 in Q3 2017, down 0.3% from Q2 2017 and down 2.5% from Q3 2016 primarily due to the continued adoption of T-Mobile ONE including taxes and fees, dilution from promotional activities and negative hurricane related impacts of $0.19, partially offset by the impact of the MVNO transaction and Data Stash for the year-over-year period. T-Mobile continues to expect that branded postpaid phone ARPU in full-year 2017 will be generally stable compared to full-year 2016, with some quarterly variations driven by the actual migrations to T-Mobile ONE rate plans, inclusive of Un-carrier Next.

• Branded prepaid ARPU was a record-high $38.93 in Q3 2017, up 2.4% from Q3 2016, primarily due to continued growth of MetroPCS customers who generate higher ARPU, partially offset by negative hurricane related impacts of $0.18.

• Net income increased 50% year-over-year in Q3 2017 to $550 million. Net income as a percentage of service revenue was 7% in Q3 2017, up from 5% in Q3 2016. The negative impact on net income from hurricane related losses in Texas, Florida and Puerto Rico from lost revenue, assets damaged or destroyed and other costs incurred was $90 million in Q3 2017. As of September 30, 2017, our assessment of losses is ongoing and we expect additional expenses to be incurred and customer activity to be impacted in Q4 2017 primarily related to our operations in Puerto Rico. We have not recognized any potential insurance recoveries related to those hurricane losses as we continue to assess the damage and work with our insurance carriers.

• Diluted EPS increased 50% year-over-year in Q3 2017 to $0.63. The negative impact from hurricanes for Q3 2017 was $0.10.

• Adjusted EBITDA increased 5% year-over-year in Q3 2017 to a Q3 record-high of $2.8 billion primarily from higher service revenues and lower losses on equipment, partially offset by higher SG&A costs, higher cost of services expense, lower gains on disposal of spectrum licenses and a $148 million negative impact from hurricanes. Excluding spectrum gains from all periods, Adjusted EBITDA growth was 12% year-over-year. Adjusted EBITDA margin as a percentage of service revenue was 37% in Q3 2017, down from 38% in Q3 2016. The decrease was primarily driven by lower gains on disposal of spectrum licenses compared to prior year period.

• Cash purchases of property and equipment increased 24% year-over-year in Q3 2017 to $1.4 billion and included capitalized interest of $29 million in Q3 2017 compared to $17 million in Q3 2016.

• Net cash provided by operating activities increased 36% year-over-year in Q3 2017 to $2.4 billion. The increase was primarily due to higher net income and higher non-cash adjustments to net income and a lower net use from working capital changes.

• Free cash flow increased 59% year-over-year in Q3 2017 to a record $921 million. The increase was primarily due to the increase in net cash provided by operating activities, partially offset by an increase in cash purchases of property and equipment.

Customer Growth Expected to Lead the Industry

We listen to customers, solve their pain points and give them unmatched service on America's Best Unlimited Network. Our formula is simple, but our straightforward approach has completely disrupted the wireless industry for nearly half a decade and forced the competition to respond to our moves.

• During the third quarter of 2017, we retitled our “Branded postpaid mobile broadband customers” category to “Branded postpaid other customers” and reclassified 253,000 DIGITS customer net additions from our “Branded postpaid phone customers” category for the second quarter of 2017, when the DIGITS product was released.
• We believe current and future regulatory changes have made the Lifeline program offered by our wholesale partners uneconomical. We will continue to support our wholesale partners offering the Lifeline program, but have excluded the Lifeline customers from our reported wholesale subscriber base resulting in the removal of 160,000 and 4,368,000 reported wholesale customers as of the beginning of the third quarter of 2017 and the second quarter of 2017, respectively. No further Lifeline adjustments are expected in future periods.

• Total net customer additions were 1.3 million in Q3 2017, bringing our total customer count to 70.7 million. Q3 2017 marks 18 straight quarters in which T-Mobile generated more than 1 million total net customer additions.

• Branded postpaid net customer additions were 817,000 in Q3 2017, which is expected to lead the industry for the 7th consecutive quarter.

• Branded postpaid phone net customer additions were 595,000 in Q3 2017, driven by back to school seasonality and strong customer response to promotional activities and Un-carrier initiatives, including Netflix On Us. Q3 2017 is expected to mark the 15th consecutive quarter that T-Mobile has led the industry in this category. While growth accelerated sequentially, the increase was less than last year primarily due to lower gross customer additions from increased competitive activity in the marketplace, the split and shift in iPhone launch timing and the negative impact from hurricanes. Branded postpaid phone churn was 1.23% in Q3 2017, down 9 basis points from Q3 2016.

• Branded prepaid net customer additions were 226,000 in Q3 2017, down year-over-year due to higher deactivations from a growing customer base and increased competitive activity in the marketplace. Branded prepaid net customer additions were up sequentially primarily due to the success of MetroPCS promotions in the quarter and lower churn for legacy T-Mobile prepaid customers, partially offset by higher MetroPCS deactivations from increased competitive activity in the marketplace. Branded prepaid churn was 4.25% in Q3 2017, up 34 basis points compared to Q2 2017 and up 43 basis points compared to Q3 2016.

Strong Network and Distribution Expansion

Our network and distribution expansion is allowing us to bring America's Best Unlimited Network to every coverable inch of the country and provide rural America with real wireless choice. Our network remains the fastest in America, a title we have held for the last 15 quarters in a row. With more spectrum being cleared and deployed and the implementation of new technology, we will continue to broaden and deepen our coverage for the benefit of all customers.

During Q3 2017, we have continued to make investments to expand and improve our network including:

• Clearing and deploying 600 MHz spectrum. At least 10 MHz covering more than 1.2 million square miles will be clear and ready to deploy in 2017, with one compatible device out already and another expected to be ready for the 2017 holiday season. We also expect the majority of new devices introduced in 2018 to be compatible with our 600 MHz spectrum. We have deployed 600 MHz spectrum in Cheyenne, Wyoming and Scarborough, Maine and expect to have additional cities and areas in multiple states come online in 2017. We will also use a portion of our 600 MHz spectrum holdings to deploy America’s first nationwide 5G network in the 2019 / 2020 time frame.
• Expanding our 4G LTE coverage breadth to 316 million people. We are targeting 4G LTE coverage of 321 million people by the end of 2017.
• Growing our distribution footprint by 30 to 40 million POPs from the beginning of 2016 through year-end 2017. We plan to open 3,000 stores in 2017, including 1,500 T-Mobile stores and 1,500 MetroPCS stores. To date, we have built 1,200 new T-Mobile stores and 1,300 net new MetroPCS stores.

Continued strong outlook for 2017

We are raising and narrowing our postpaid net customer additions guidance to 3.3 - 3.6 million from 3.0 - 3.6 million.

Net income is not available on a forward looking basis.

We are raising and narrowing our Adjusted EBITDA target for the second time this year to between $10.8 and $11.0 billion, up from the prior guidance range of $10.5 - $10.9 billion. Our Adjusted EBITDA target includes unchanged guidance on leasing revenues of $0.85 - $0.95 billion.

The guidance for cash purchases of property and equipment, excluding capitalized interest, is unchanged at $4.8 - $5.1 billion, but we expect to be at the high end of the guidance range.

The three-year CAGRs guidance for net cash provided by operating activities and Free Cash Flow from full-year 2016 to full-year 2019 also remains unchanged at 15% - 18% and 45% - 48%, respectively.