Back in January AT&T bought out Cingular. They immediately  launched an advertising campaign to replace the brand with it’s on stuff. It made  the Cingular logo a part of it’s own.  It’s been a free frail with AT&T. They were bought out by other companies and then they would buy someone else on and so on and so fourth. However there is a well known lawsuit that claims Cingular intentionally allowed the AT&T network to degrade to encourage their customers to switch to Cingular.