ClearwireClearwire MayMay 20072007 Forward Looking Statement

This presentation, and other oral and written statements made by from time to time, contains forward-looking statements which are based on management’s current expectations and beliefs, as well as on a number of assumptions concerning future events made with information that is currently available. Forward-looking statements may include, without limitation, management’s expectations regarding: future financial and operating performance and financial condition; development, network launch, and strategic plans and objectives; industry conditions; the strength of its balance sheet; and liquidity and financing needs. Readers are cautioned not to put undue reliance on such forward-looking statements, which are not a guarantee of performance and are subject to a number of uncertainties and other factors, many of which are outside of Clearwire's control, which could cause actual results to differ materially and adversely from such statements. Some factors that could cause actual results to differ are: – We are an early stage company with a history of operating losses and we expect to continue to realize significant net losses for the foreseeable future. – Our business plan will require us to raise substantial additional financing both in the near term and over the next five years or more. – We are committed to using commercially reasonable efforts to deploy broadband networks based solely on mobile WiMAX technology once that technology meets certain specified performance criteria, even if there are alternative technologies available in the future that are technologically superior or more cost effective. – Our business plan contemplates migration of our current network to a mobile WiMAX network, which is not yet commercially available, and may never be developed to our satisfaction or at all. – We currently depend on our commercial partners to develop and deliver the equipment for our existing and planned networks. – Many of our competitors are better established and have significantly greater resources, and may subsidize their competitive offerings with other products and services. – Our substantial indebtedness and restrictive debt covenants could limit our financing options and liquidity position and may limit our ability to grow our business. – Craig McCaw and Capital collectively control a majority of our combined voting power, and may have, or may develop in the future, interests that may diverge from other stockholders. – Future sales of large blocks of our common stock may adversely impact our stock price. For a more detailed description of the factors that could cause such a difference, please refer to Clearwire’s filings with the Securities and Exchange Commission, including the information under the headings “Risk Factors” and “Forward-Looking Statements” in our 10k filed on May 15, 2007. Clearwire assumes no obligation to update or supplement such forward- looking statements. A reconciliation of any non-GAAP financial measures included in this presentation can be found in the press release issued by Clearwire on May 8, 2007, available on the Company’s website.

1 An Evolutionary Approach to Providing Simple, Fast, Portable, Reliable and Affordable Broadband Services

2 Consistent Progression with Strong Momentum

Dec. 2004 Dec. 2005 Dec. 2006

U.S. Markets Deployed 32534

U.S. EBITDAM Positive Markets (1) —329

U.S. EBITDA Positive Markets (2) ——4

Consolidated Subscribers 3,500 62,300 206,200

Total Covered POPs 480,000 4,600,000 9,600,000 Consolidated Spectrum 5.4Bn 10.7Bn 20.7Bn Portfolio (MHz/POPS)

X Founded in October 2003 by Craig McCaw and a team of wireless veterans X Strong Strategic Sponsorship from Intel, Motorola and Bell Canada with over $1.1Bn invested

(1) EBTIDAM iiss a non-GAAP measure defined as Earnings before Taxes, Interest, Depreciation, Amortization, Sales and Marketing expense (2) EBITDA iiss a non-GAAP measure defined as Earnings before Taxes, Interest, Depreciation, and Amortization

3 Differentiation Drives Strong Demand

Sources of Clearwire’s Customer Usage (1) Customer Base (1)

School No Internet Other 6% 12% Dial-Up 3% 27%

48% 43% 33% 2% Other Business or Personal Personal and Cable 26% Use Only Business Modem Related Use DSL

(1) CClearwirelearwire Customer Survey Mar 2007

4 Improving Distribution Channels

Q1’06 (%) Q1’07 (%)

Clearwire Direct Reps 39 22

Local Indirect Dealers 25 30

Nat’l Big Box Retailers 6 11

Clearwire Retail 21 22

Web/Telesales 9 13

Wholesale 0 2

5 Current and Planned U.S. Markets Through 2007

Bellingham, WA Existing Markets Seattle/Tacoma, WA Wenatchee, WA Q2’07 Launched Aberdeen, WA Yakima, WA Expansion States Lewiston, ID Tri-Cities, WA Duluth, MN Eugene, OR Bend, OR St. Cloud, MN Grants Pass, OR Roseburg, OR and Vicinity Medford, OR Boise, ID Eau Claire, WI Redding, CA Klamath Falls, OR Chico, CA Reno, NV Stockton, CA Modesto, CA Merced, CA Richmond, VA Visalia, CA Greensboro, NC Raleigh, NC

Amarillo, TX Wichita Falls, TX Lubbock, TX Abilene, TX Maui, HI Waco, TX Honolulu, HI Midland Odessa, TX Jacksonville, FL Killeen/Temple, TX Daytona Beach, FL

Anchorage, AK

Targeting over 16-18MM POPs covered by our network by yearend 2007

6 Extensive 2.5GHz Spectrum Footprint – Mobile WiMAX Spectrum

Portfolio of 14bn MHz/Pops of 2.5Ghz.

Covers approximately 223m people in the U.S. . AT&T/Bell South Acquisition: 1.7bn MHz Pops focused in the S.E.

Spectrum includes owned, leased and pending acquisitions Spectrum depths range from 12 MHz to 196 MHz

7 Expanding 3.5 GHz European Footprint

8.7 Bn MHz-POPs

Ireland Belgium Denmark • 85MHz of spectrum • 100MHz of spectrum • 100MHz of spectrum covering 1.5MM people covering 10.4MM people covering 5.4MM people • Currently operating in • Currently operating in • In partnership with Dublin Brussels Danske Telecom

Poland Germany • 28MHz of spectrum • 42MHz of spectrum covering 38.1MM people covering 82.5MM people

Romania • 56MHz of spectrum covering 21.6MM people Spain • 40MHz of spectrum covering 45.1MM people Operating Markets Markets in Development

8 Clearwire Network – Simple and Efficient

Legacy Wireless: Data and Voice Network

PSTN HLR BSS (GSM / EDGE) MSC BTS SGSN GGSN BSC Packet Internet Backbone MGW Network

GGSN Clearwire Cellular Clearwire RNC BTS ATM Base Station Shelter Cabinet

UTRAN (WCDMA) SGSN

Clearwire: Data and Voice Network Clearwire Cellular

Internet Antennas per site 3 9

Tower Cabling 3 Cables 9 – 12 Coax runs POP BTS PSTN Ground Space 4’X3’ 10’X12’ VOIP GW

9 Anticipated Transition to WiMax Offers Expanded Opportunity

CPE PC Card Embedded WiMAX

Today 2H’07 2008

X With Intel and Motorola’s collaboration Clearwire has a path to high volume and low cost X Intel’s efforts in laptop integration driving thinking on new embedded devices X Standardized technology will lead to proliferation of new devices

10 Strong Year-over-Year Performance

Q1 ‘06 Q1 ‘07

Covered Pops 5.8MM 10.1MM Total Subscribers 99k 258k ARPU $32.37 $35.80 Churn 1.4% 1.6% CPGA $361 $343 Service Revenue $9.5MM $29.3MM

Service Gross Margin $.8MM $12.5MM

EBITDA Loss (1) $(37.7)MM $(70.0)MM

Adjusted EBITDA Loss (2) $(33.0)MM $(51.5)MM

Capital Expenditures $29.5MM $74.4MM

(1) EBITDA is a non-GAAP measure defined as Earnings before Taxes, Interest, Depreciation, and AmortAmortizationization (2) Adjusted EBITDA is EBITDA less ssignificantignificant non-cash itemsitems..

11 Initial 25 Market Performance

Q1 ‘06 Q1 ‘07 Initial 25 Markets

Covered Pops 3.9MM 4.2MM Subscribers 85k 175k ARPU $32.51 $36.20 Churn 1.4% 1.7%

CPGA $366 $318

Total Revenue $6.9MM $18.1MM

Gross Margin $3.3MM $13.1MM Gross Margin % 48% 72%

Market EBITDA (1) $(9.5)MM $(.6)MM Market EBITDA % (138)% (3)%

Markets EBITDA – 10 Positive

(1) Market EBITDA does not incincludelude corporate G&A and Spectrum Expense

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