CORNERSTONE TAPPED BY BOOST MOBILE TO PROMOTE NATIONWIDE VOLUNTEER MOVEMENT BOOST MOBILE ROCKCORPS

- Leading Marketing Firm Tapped To Drive Awareness For National Campaign, Combining The Power Of Music, Community And Volunteerism -

NEW YORK , New York - March 14, 2007 - Cornerstone, a leading marketing firm, today announced that the company has been tapped for the third year in a row to promote Boost Mobile RockCorps (BMRC). The partnership between Boost Mobile and RockCorps is a national initiative that collaborates with non-profit organizations to make a real difference on a local level. Cornerstone's campaign will "boost" awareness of Boost Mobile RockCorps with grassroots marketing and local market payoff events across the country.

Elements of Cornerstone's comprehensive 360-degree program to promote BMRC include producing local tour stop concert events and getting the word out on a local and national level through traditional and non-traditional means. This includes blanketing local markets, developing a comprehensive online and digital program and establishing key radio partnerships.

Markets this year include Los Angeles, Atlanta and New York. An additional 10 cities will be announced in the coming weeks.

"The Boost Mobile RockCorps campaign perfectly aligns with Cornerstone's strengths and passions," said Rob Stone, founder and co-president of Cornerstone. "Boost Mobile RockCorps is a perfect partner for us as they understand the power of music and the importance of community."

Last year, BMRC volunteers received tickets to popular music concerts in their area in exchange for contributing four hours of community service. Highlights included Panic! At The Disco, The Game, Young Jeezy, Rick Ross and Taking Back Sunday.

Since 2005, Boost Mobile RockCorps has inspired more than 16,000 young people to contribute to their communities. By the end of the 2006 tour, BMRC volunteers contributed approximately 40,000 hours of community service and transformed close to 125 project sites in eight cities across the country. The 2007 Boost Mobile RockCorps Tour will include an expanded roster of cities and an even more diverse list of volunteer partners and reward activities.

About Cornerstone
Based in New York City and helmed by Rob Stone and Jon Cohen, Cornerstone is a full-service marketing firm that builds emerging brands and reenergizes established ones. Representing Fortune 500 clients across multiple disciplines — with an emphasis on consumer products and services and entertainment industries — Cornerstone designs and executes customized and innovative brand strategies that target and effectively reach the elusive market of 15-34 year olds.

About Boost Mobile
Based in Irvine, California, Boost Mobile, LLC, a division of Sprint Nextel Corporation, (NYSE: S), is a lifestyle-based telecommunications brand focused on offering premium Pay-As-You-Go wireless phones and services to the youth market. Boost is among the fastest growing wireless services in the U.S. and now has more than 3.8 million customers - the majority of which are under the age of 25. Boost-branded wireless phones with its exclusive Boost™ Walkie-Talkie service and Re-Boost® Cards are available nationwide at locations where youth prefer to shop, including national retailers and convenience stores, and merchants that focus on fashion, music, and action sports-related activities. Boost Mobile is dedicated to boosting the lives of today's young people by contributing to youth development programs. Boost's community relations efforts, which include support to local chapters of Big Brothers Big Sisters of America, Historically Black Colleges and Universities, youth basketball camps and more, are helping young people enhance their lifestyle and status, and build stronger connection and greater independence. Experience Boost on the Web at www.boostmobile.com

About RockCorps
RockCorps is an organization that harnesses the power of music to inspire volunteerism. Based on the early work of The Greenbucks Foundation, RockCorps was founded in 2003 to affect social change and act as the bridge between communities in need and the young adults who want to make them better. RockCorps' goals are to introduce volunteerism to teens and young adults, motivate people to volunteer in their community and launch a national movement. The company has formulated a unique blend of music, community and volunteerism to expose young people to simple ways they can proactively contribute to the greater good. The program employs music as an incentive to entice and then funnel volunteers through established non-profit organizations. By completing four hours of community service, each participant receives a ticket to a signature RockCorps event which features performances by some of the hottest names in music. Experience shows that after volunteering once with RockCorps, young people are twice as likely to do it again.