Shares of telecom giant AT&T (NYSE: T) did not fare well after the company reported its second-quarter results last month. AT&T's results were just fine -- both revenue and adjusted earnings came in ahead of expectations. The company added postpaid phone subscribers at a healthy pace, and the fiber business continued to steadily grow.

It was AT&T's guidance that put investors in a sour mood.

AT&T has been growing its customer base quicker than expected. The company added 813,000 postpaid phone subscribers in the second quarter, which helped push up revenue in the mobility segment 5.2%. AT&T also benefited from a 1.1% increase in average revenue per user as customers embraced unlimited plans.

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Source Fool.com