AT&T just posted its earnings for the first quarter of 2013, and the market couldn't help but ding the company, which is now trading down in after hours markets. The business as a whole posted a net income of $3.7 billion, which is slightly up from $3.6 billion one year ago. Meanwhile, company revenues took a slight hit, which sit at $31.4 billion -- down 1.4 percent from the previous year. In terms of the company's wireless business, though, there's plenty of reason for optimism. The company was able to snag an additional 296,000 postpaid subscribers and put a solid 1.2 million people on smartphone p
