T-Mobile is adding a new extension to its local sponsorship strategy.The U.S. unit of Deutsche Telekom plans to expand its sponsorship portfolio (Major League Baseball, T-Mobile Arena, American Music Awards, etc.) with ties to local properties in new and underperforming markets.“One of the priorities for T-Mobile going forward is going deeper in the community, going deeper locally,” said Meredith Starkey, T-Mobile vice president of sponsorship and events, in her presentation at IEG 2018.T-...