However, it is understood that GSD&M will now report to BBDO rather than directly to the client. The Rogers Townsend agency in St Louis will still handle other AT&T assignments.
The roster changes reflect the strategy set for AT&T by its newly appointed chief executive, Randall Stephenson, to concentrate on wireless and mobility.
The company has launched a series of branding efforts since December 2005, when it put $500 million behind a GSD&M campaign under the theme: "Your world. Delivered."