Major video game retailer GameStop is making a significant push to broaden its business, expanding its retail operations with new brands and stores that will focus on Apple gear and AT&T Mobility products, reports The Star-Telegram. While the diversification will include a move into AT&T mobile services through GameStop's acquisition of Spring Mobile, of more interest for Apple users is GameStop's plans for Simply Mac, a chain of authorized Apple resale and repair shops that focuses on smaller markets where Apple has not shown interest in opening its own stores. Founded in 2006 in Utah, Simply Mac grew to eight stores by October 2012 when Ga