(Reuters) -AT&T added more wireless subscribers than expected in the third quarter on Wednesday, as bundled plans and heavy promotions around the latest iPhone launch helped it attract more customers in a fiercely competitive market. Shares of the company were up 4% in premarket trading. The quarter ended September is a critical period for U.S. wireless carriers, with competition peaking around Apple's annual iPhone launch. Like all other carriers, AT&T has also rolled out lucrative promotions for the iPhone 17 series to lock in new subscribers and encourage existing users to upgrade to pricier plans. It added 405,000 monthly bill paying wireless subscribers, compared to expectations for 334,100 additions, according to FactSet. By packaging wireless and fiber broadband services together fo

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