DALLAS--(BUSINESS WIRE)--AT&T Inc. (NYSE:T) today reported solid first-quarter results with strong wireless net adds, best-ever first-quarter postpaid churn and strong demand for strategic business services. “The first quarter was a significant step in a transformative year for AT&T” said Randall Stephenson, AT&T chairman and CEO. “The repositioning of our wireless customer base to no-device-subsidy plans drove industry-leading postpaid churn. IP technologies continue to transform o