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According to the press release:

Virgin Mobile USA, in partnership with Warner Music Group, today announced the latest artist in the company's popular First Dibs ringtone lineup -- Bad Boy's new R&B/pop sensation, Cassie. This First Dibs offer runs from August 17th - September 21st.

Virgin Mobile is the only wireless service in the U.S. offering its customers access to exclusive a cappella and instrumental ringtone versions of five of Cassie's hottest tracks off her self-titled debut album, "Cassie." This includes exclusive versions of "Me & U," the single burning up the R&B charts. Virgin Mobile's four million customers also have the unique opportunity to hear Cassie's perspective on her new-found fame first-hand, through downloadable original interview excerpts.