AT&T Inc. (T) has reinforced its focus on the customer-centric business model by promising to pay bill credits for any network outage across its wireless and fiber networks for consumers and small businesses. The first-of-its-kind industry initiative, dubbed AT&T Guarantee, aims to maintain customer loyalty and win back trust after the carrier faced severe backlash for a nationwide wireless service outage last year.An independent investigation by the Federal Communications Commission found that the 12-hour ...