The proposed merger between AT&T and T-Mobile USA would create the largest carrier in the U.S. and would likely have repercussions for the agencies that work on their advertising. For instance, Publicis, Seattle, worked on creative for T-Mobile MyTouch 4G ads that made fun of the iPhone and the AT&T network. AT&T's main agency is currently BBDO -- a relationship that harks back to AT&T's 2007 merger with Cingular.

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