Shares of AT&T (T) are trading higher at Wednesday's open after the company revealed it added more wireless phone subscribers than expected in the first quarter. The telecommunications giant added 349,000 new postpaid phone connections, outperforming analysts' expectations of 304,000 additions. Yahoo Finance's Seana Smith and Brad Smith break down the details, providing insights into AT&T's growth despite increased competition. For more expert insight and the latest market action, click here to... Read this story