AT&T today released its earnings for the second quarter of 2011. Revenue was up $680 million (2.2 percent) to $31.5 billion compared to the second quarter of last year. AT&T says 70 percent of its postpaid sales were from smartphones, and that it had a record second quarter with 5.6 million smartphones sold. On top of that, sales of Android "and other smartphones" (are there any other kinds?) doubled year over year.

AT&T currently has the HTC Status and Inspire 4G, LG Phoenix, Motorola Flipside and Atrix, Pantech Crossover, and the Samsung Captivate and Infuse 4G in its Android arsenal.

Source: AT&T; More: iPhone numbers from TiPb