AT&T is one of Apple's closest business partners and was the sole U.S. carrier of the iPhone between 2007 and 2011. In February 2011, competitor Verizon Communications also began selling the iPhone 4.
For AT&T, the iPhone has been a major hit. The company, for example, had 3.6 million activations of iPhones in just the first three months of 2011, 23 percent of whom were new subscribers to AT&T. In the first half of this year alone, AT&T has had 7.2 million iPhone activations.
After Apple announced that Steve Jobs would step down as CEO, the chairman and CEO of AT&T, Randall Stephenson, released a statement saying Jobs "is one of the industry's most gifted entrepreneurs, visionaries, and creative minds." The wireless provider also said it looked forward to collaborating with the new CEO Tim Cook and his team.