Goodby, AT&T Wireless Split Up

AT&T Wireless has split with its creative agency, Omnicom’s Goodby, Silverstein & Partners in San Francisco, saying last week that the move was precipitated by the company’s pending merger with Cingular Wireless. Goodby and Cingular reps declined comment. The business is worth an estimated $125 million. Omnicom’s BBDO in New York is lead agency for Cingular, which spent nearly $625 million on ads last year, according to TNS Media Intelligence/CMR.