DALLAS–(BUSINESS WIRE)–AT&T Inc. (NYSE:T) reported first-quarter results that showed continuing customer growth in wireless, fiber and HBO Max and strong cash flows. “We continued to excel in growing customer relationships in our market focus areas of mobility, fiber and HBO Max,” said John Stankey, AT&T CEO. “We had another strong quarter of postpaid phone net adds, higher gross adds, lower churn and good growth in Mobility EBITDA. We also continue to increase penetration in markets