AT&T Shares Climb on Subscriber Additions. Should Investors Add the Stock to Their Portfolios?

What could be the next catalyst for the stock?Share prices of AT&T (T -0.94%) were heading nicely higher after the wireless company saw solid subscriber additions and generated strong free cash flow when it reported its second-quarter results. The rally pushed the stock's gain for the year up to 14%.Let's take a look a AT&T's Q2 results and determine whether now is a good time to buy the stock.Strong subscriber additionsFor the quarter, AT&T saw solid results in its wireless business, with 593,000 retail po ...