AT&T Inc T last week was in the news for the wrong reasons, as hackers gained unauthorized access to its data systems.There is 5%-6% upside to the Street's EBITDA estimates for the company and improving growth could drive "double-digit annualized returns for the stock," according to Goldman Sachs.Analyst James Schneider maintained a Buy rating and price target of $25.The AT&T Thesis: Both competitive intensity and capital intensity have moderated in the U.S. wireless industry, and this trend is expected to ...