In April 2005, the law firm of Callahan, McCune and Kelis ringtones filed a class action lawsuit against Jamster! on behalf of a San Diego father and his ten-year-old daughter.Pixies ringtones claimed that Cingular billed its customers for Jamster! and other similar ring tone services without providing customers with the notice, opt-in, and proof of authorization requirements necessary for such charges.To fully integrate the BlackBerry into a Katharine McPhee ringtones, the installation of BlackBerry Enterprise Server (BES) is required.