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Comscore Reports February 2011 U.S. Mobile Subscriber Market Share

Android Platform Now Accounts for 1 in 3 Smartphone Users

RESTON, VA, April 1, 2011 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released data from the Comscore MobiLens service, reporting key trends in the U.S. mobile phone industry during the three month average period ending February 2011. The study surveyed more than 30,000 U.S. mobile subscribers and found Samsung to be the top handset manufacturer overall with 24.8 percent market share. Google Android led among smartphone platforms with 33.0 percent market share.

OEM Market Share

For the three month average period ending in February, 234 million Americans ages 13 and older used mobile devices. Device manufacturer Samsung ranked as the top OEM with 24.8 percent of U.S. mobile subscribers, up 0.3 percentage points from the three month period ending in November. LG ranked second with 20.9 percent share, followed by Motorola (16.1 percent) and RIM (8.6 percent). Apple saw the strongest gain, up 0.9 percentage points to account for 7.5 percent of subscribers, on momentum from the release of the Verizon iPhone, the most acquired handset in the month of February.

Top Mobile OEMs

3 Month Avg. Ending Feb. 2011 vs. 3 Month Avg. Ending Nov. 2010

Total U.S. Mobile Subscribers Ages 13+

Source: Comscore MobiLens Share (%) of Mobile Subscribers Nov-10 Feb-11 Point Change Total Mobile Subscribers 100.0% 100.0% N/A Samsung 24.5% 24.8% 0.3 LG 20.9% 20.9% 0.0 Motorola 17.0% 16.1% -0.9 RIM 8.8% 8.6% -0.2 Apple 6.6% 7.5% 0.9

Smartphone Platform Market Share

69.5 million people in the U.S. owned smartphones during the three months ending in February 2011, up 13 percent from the preceding three-month period. Google Android grew 7.0 percentage points since November, strengthening its #1 position with 33.0 percent market share. RIM ranked second with 28.9 percent market share, followed by Apple with 25.2 percent. Microsoft (7.7 percent) and Palm (2.8 percent) rounded out the top five.

Top Smartphone Platforms

3 Month Avg. Ending Feb. 2011 vs. 3 Month Avg. Ending Nov. 2010

Total U.S. Smartphone Subscribers Ages 13+

Source: Comscore MobiLens Share (%) of Smartphone Subscribers Nov-10 Feb-11 Point Change Total Smartphone Subscribers 100.0% 100.0% N/A Google 26.0% 33.0% 7.0 RIM 33.5% 28.9% -4.6 Apple 25.0% 25.2% 0.2 Microsoft 9.0% 7.7% -1.3 Palm 3.9% 2.8% -1.1

Mobile Content Usage

In February, 68.8 percent of U.S. mobile subscribers used text messaging on their mobile device. Browsers were used by 38.4 percent of subscribers (up 3.1 percentage points), while downloaded applications were used by 36.6 percent of the mobile audience (up 3.2 percentage points). Accessing of social networking sites or blogs increased 3.3 percentage points, representing 26.8 percent of mobile subscribers. Playing games represented 24.6 percent of the mobile audience, while listening to music represented 17.5 percent.

Mobile Content Usage

3 Month Avg. Ending Feb. 2011 vs. 3 Month Avg. Ending Nov. 2010

Total U.S. Mobile Subscribers Ages 13+

Source: Comscore MobiLens Share (%) of Mobile Subscribers Nov-10 Feb-11 Point Change Total Mobile Subscribers 100.0% 100.0% N/A Sent text message to another phone 67.1% 68.8% 1.7 Used browser 35.3% 38.4% 3.1 Used downloaded apps 33.4% 36.6% 3.2 Accessed social networking site or blog 23.5% 26.8% 3.3 Played Games 22.6% 24.6% 2.0 Listened to music on mobile phone 15.0% 17.5% 2.5

About Comscore

Comscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital business analytics. For more information, please visit www.comscore.com/companyinfo.

Contact:

Adam Lella

Comscore, Inc.

+1 (312) 775-6474

press@comscore.com