T-Mobile USA Robert Dotson CEO & President

T-Mobile USA

Robert Dotson CEO & President

January 9, 2006

Disclaimer

This presentation contains forward-looking statements that reflect the current views of Deutsche Telekom

management with respect to future events. The words “anticipate”, “believe”, “estimate”, “expect”, “intend”, “may”,

“plan”, “project” and “should ” and similar expressions are intended to identify forward-looking statements. Forward- looking statements are based on current plans, estimates, and projections, and therefore

you should not place too much reliance on them. Such statements are subject to risks and uncertainties, most of which are difficult to predict and are generally beyond Deutsche Telekom`s control, including, without limitation, those factors set forth in “Forward-Looking Statements” and “Risk Factors” contained in Deutsche Telekom’s annual report on Form 20-F filed on March 15, 2005. If these or other risks and uncertainties materialize, or if the

assumptions underlying any of these statements prove incorrect, Deutsche Telekom’s actual results may be materially different from those expressed or implied by such statements. Deutsche Telekom does not intend or assume any obligation to update these forward-looking statements.

This presentation contains a number of non-GAAP figures, such as OIBDA, OIBDA margin, CPGA, CCPU, EBITDA and EBITDA adj. for special factors, EBITDA margin adj., capex, special factors, adj. net income, ARPU, free cash flow, and gross and net debt. These non-GAAP figures should not be viewed as a substitute for our GAAP figures.

Our non-GAAP measures may not be comparable to non-GAAP measures used by other companies. To interpret the non-GAAP measures, please refer to the “Reconciliation to pro forma figures” in the Q1/04 interim report or the

“Reconciliation to pro forma figures” posted on Deutsche Telekom’s Investor relations link under

www.telekom.de/investor-relations. With regard to OIBDA, OIBDA margin, CPGA, and CCPU, please see the reconciliation in the backup to this presentation and the T-Mobile USA earnings release published on November 9, 2005.

Page 3

U.S. Wireless Industry Robust Growth 2006

Industry Growth

ƒ Penetration headroom (mid to high 80s)

ƒ Carrier-slowed growth appears self-imposed

ƒ Landline replacement accelerating

Industry Consolidation

ƒ Price stability

ƒ Quality up—churn down

Industry Ecosystem

ƒ Renewed investment & innovation

ƒ Venture capital start-ups

ƒ Device & infrastructure suppliers

Wireless penetration (%)

46 50 56

63 70

2001 2002 2003 2004 2005E

Monthly churn rate (%)

2.77 2.73

2.36 2.35

1.98

2001 2002 2003 2004 2005E

1 Source: Citigroup.

2 Average of quarterly rates. Source: Merrill Lynch.

Page 4

Global T-Mobile Business Delivering U.S. benefits

Europe driven by stronger Germany

ƒ Europe: €4.0 billion cash contribution

YTD ’05

ƒ Germany: €2.4 billion

Europe leading 3G: “web’n’walk—Internet in Your Pocket”

ƒ Testing and selective deployment of 4G platforms

Global scale 83 million customers

ƒ $1.6B in hard global savings

ƒ Infrastructure & handsets

U.S. current & future DT growth engine

ƒ Firm DT commitment to U.S.

ƒ Participation in AWS auction

1 Adj. EBITDA – capex. Europe incl. Eastern Europe.

Page 5

T-Mobile: Top Two in U.S. Growth

-1,000 0 1,000 2,000 3,000 4,000 5,000

Q3/01 Q3/02 Q3/03 Q3/04 Q3/05

-5,000 0 5,000 10,000 15,000 20,000 25,000

Service rev. OIBDA/adj. EBITDA Customers

($ million) 20.3 M (‘000)

Year over Year Performance

$3.2 B

$1.2 B

• Exceeded 20 Million Customers—Size “2003 AT&T Wireless”

• Consistent performance all metrics

Page 6

Delivering DT Profitable Growth Objective

1 Q1-Q3. OIBDA divided by total revenues less equipment sales.

OIBDA margin 31% in 2005 (thru Q3 2005)

Service revenues 2005

ƒ +24% to $9.0 billion OIBDA 2005

ƒ +54% to $3.1 billion

OIBDA margin (%)

24

27

31

YTD '03 YTD '04 YTD '05

Page 7

T-Mobile USA Happiest Customers in Wireless

Brand awareness 96%

ƒ Half the spending of other national carriers

ƒ 1 M+ quality prepay customers past 12 months

Back to Back #1 JD Powers—All 6 Regions

ƒ Overall Customer Satisfaction

ƒ Retail Service

ƒ Customer Care

Most focused wireless company

ƒ No significant impact of consolidation

ƒ Postpay churn reduced from 2.5% to 2.3%

(thru Q3 vs. 2004)

1 Q4 2004 – Q3 2005.

Page 8

Exploded Geographic Coverage 56% in 2005

ƒ Over 500,000 sq miles

ƒ 1900 and 850 roaming

(Roaming cost per MOU down 87%

—minimal CCPU impact)

ƒ ~33,000 total cell sites

(Almost 3,500 in 2005 3,000+ planned in 2006)

ƒ Spectral Efficiency/Capacity AMR & SAIC

ƒ Rated #2 nationally JD Powers call quality performance study

1 1998- 2005.

Page 9

Cost Efficiency Operational Legacy

Rivaling or besting carriers 2x size

ƒ Disciplined marketing, sales and distribution

ƒ Scale benefits – 83 million customers globally

CPGA in Q3/05 ($)

271 300

475

293

T-Mobile Cingular Sprint Nextel

Verizon

CCPU in Q3/05 ($)

24.65 25.35

31.04

21.66

T-Mobile Cingular Sprint Nextel

Verizon

1 Source: Citigroup estimates.

Page 10

Developing New Consumer Data Category

Data ARPU almost doubled since Q1 2004

Approaching 1 million Converged Device Users

ƒ ~700k BlackBerry

ƒ 300k Sidekick Data ARPU

(in % of postpaid ARPU)

1 Does not include WiFi.

4.5 5.6

7.6 8.8

Q1 '04 Q3 '04 Q1 '05 Q3 '05

Page 11

Future Growth T-Mobile @ Home Opportunity

ƒ U.S. broadband penetration >40%

(29% y-o-y increase)

ƒ Riding WiFi Asset/Knowledge base

ƒ Motorola, Nokia, and Samsung devices currently in user trials

ƒ Commercial launch 2

half 2006

1 U.S. broadband penetration in % of U.S. households (source: Citigroup)

Page 12

T-Mobile’s Mission: Most Highly Regarded Service Company in America…

ƒ Leading growth brand leveraging global scale

ƒ Top Rated by Customers

ƒ Driving consumer adoption of data

ƒ Delivering DT’s mission of Profitable Growth

Backup

Page 14

Customers (million)

14.3 15.4 16.3 17.3 18.3 19.2 20.3

12.8 13.7 14.5

16.1 16.8 17.5

1.5 1.7 1.8 2.0 2.2 2.4 2.8

15.3

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Customers Postpaid customers

Prepaid customers

Page 15

MOUs/Postpaid Customer/Month

817 885 908 907 921 960 985

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Page 16

Churn (%)

3.0 2.8 3.0 3.1

2.8 2.8 2.9

2.6 2.4 2.6

2.3 2.3 2.4

6.9

5.7

6.6 6.6 6.4 6.4 6.6

2.6

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Blended churn Postpaid churn Prepaid churn

Page 17

ARPU ($)

54 54 55 55 55 56 55 56 54 54 54 55 53 55

29 30

28 29 28 27

24

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Blended ARPU Postpaid ARPU Prepaid ARPU

Figures in US$; US GAAP format.

Page 18

CCPU and ARPU - CCPU ($)

23 23 24

28

26 26

25

31 32

31

27 28 28 28

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

CCPU ARPU - CCPU

Figures in US$; US GAAP format. Q4/04 CCPU includes cumulative lease accounting charge taken in the fourth quarter which increased CCPU by $4.

Page 19

1 See T-Mobile USA earnings release published on November 9, 2005.

2 Q4/04 CCPU includes cumulative lease accounting charge taken in the fourth quarter which increased CCPU by $4.

US GAAP Reconciliation: CCPU

The cost of serving customers, or cash cost per user (“CCPU”), includes all network and general and administrative costs divided by the average total

customers during the period. We believe CCPU is an operating measure of the cost of serving a customer, and can be calculated and reconciled to T-Mobile USA‘s interim statement of operations

as follows:

$ million Q3 ’04 Q4 ’04 Q1 ’05 Q2 ’05 Q3 ’05

Network costs 556 757 681 718 735

General and administrative 496 511 558 572 596

Total 1,052 1,268 1,239 1,290 1,331

Plus: Subsidy loss unrelated

to customer acquisition 100 122 172 153 133

Total cost of serving customers 1,152 1,390 1,411 1,443 1,464

CCPU ($/month)

24 28 26 26 25

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CPGA ($)

326 318

301

345 357

310

271

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Figures in US$; US GAAP format.

Page 21

US GAAP Reconciliation: CPGA

Cost per Gross Add (“CPGA“) is calculated by dividing the costs of acquiring a new customer, consisting of customer acquisition costs plus the subsidy loss on customer acquisition related to equipment sales, divided by gross customers added during the quarter. We believe that CPGA is a measure of the cost of acquiring a customer and we use CPGA as an integral part of our internal reporting. CPGA can be calculated and reconciled to T-Mobile

USA‘s interim statement of operations

as follows:

$ million Q3 ’04 Q4 ’04 Q1 ’05 Q2 ’05 Q3 ’05

Customer acquisition costs 622 737 711 668 657

Plus: Subsidy loss

Equipment sales - 388 - 452 - 331 - 305 - 414

Cost of equipment sales 573 719 661 575 648

Total subsidy loss 185 267 330 270 234

Less: Subsidy loss unrelated to

customer acquisition - 100 - 122 - 172 - 153 - 133 Subsidy loss related to customer

acquisition 85 145 158 117 101

Total cost of acquiring customers 707 882 869 785 758

CPGA ($/new customer added) 301 345 357 310 271

1 See T-Mobile USA earnings release published on November 9, 2005.

Page 22

Service Revenues and OIBDA ($ million)

2,208

2,464 2,612 2,748 2,854 3,040 3,153

492

717 788

515

826

1,081 1,166

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Service revenues OIBDA

Figures in US$; US GAAP format. OIBDA for Q4/04 includes a $200 cumulative charge related to lease accounting, of which $176 million relates to prior quarters of 2004 and earlier years.

Page 23

OIBDA Margin in % of Total Revenues excl.

Equipment Sales

22

29 30

19

27

33 34

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

Based on figures in US$; US GAAP format.

Page 24

US GAAP Reconciliation: OIBDA

OIBDA is a non-GAAP financial measure, which we define as operating income

before depreciation and amortization. In a capital-intensive industry such as wireless telecommunications, we consider growth in OIBDA to be a meaningful indicator of potential future profitability. OIBDA should not be construed as an alternative to

operating income/loss or net income/loss as determined in accordance with GAAP, as an alternative to cash flows from operating activities as determined in accordance with GAAP or as a measure of liquidity. We also use OIBDA as an integral part of our

internal reporting to evaluate the performance of our senior management. We believe that operating income (loss) is the financial measure calculated and presented in

accordance with GAAP that is the most directly comparable to OIBDA. OIBDA can be reconciled to T-Mobile USA’s operating income (loss)

as follows:

$ million Q3 ’04 Q4 ’04 Q1 ’05 Q2 ’05 Q3 ’05

OIBDA

788 515 826 1,081 1,166

Depreciation and amortization - 295 -265 - 519 - 585 - 558

Operating income (loss) 493 250 307 496 608

1 See T-Mobile USA earnings release published on November 9, 2005.

2 OIBDA for Q4/04 includes a $200 cumulative charge related to lease accounting, of which $176 million relates to prior quarters of 2004 and earlier years.

Page 25

Capex ¹ ($ million)

599 664

453 422

2,838

815

585

Q1/04 Q2/04 Q3/04 Q4/04 Q1/05 Q2/05 Q3/05

1 2004: not including joint venture with Cingular. Q1/05 capex include $2.46 billion related to the acquisition of the Cingular network in California and Nevada and $376 million related to other expenditures. Q2/05 capex include $235 million that were due to T-Mobile USA’s joint venture with Cook Inlet Region Inc. successfully being awarded mobile licenses in 35 markets by the FCC as a result of Auction 58.

Figures in US$; US GAAP format.