Developers Kevin Lo (@uhelios) and Daniel Levi (@Pix3lDemon) have created a Mac application that appears to change the carrier logo of any data-enabled iOS device, jailbroken or not. Video is below, and the page to the download is below that. http://uhelios.com/downloads/ I HAVE NOT TRIED THIS! I don't have a Mac, so I cannot guarantee that it works. If some community members would like to try it out and report back here, that'd be great!