In the second quarter of 2012, Apple's iPhone represented 73 percent of smartphone activations through AT&T.

iPhone with ATT Screen OpenThe new activations come at a time when AT&T, like Verizon, is changing its pricing structures to account for mobile device data usage. Both companies are offering customers plans with unlimited text messages and calls. The price difference depends on the amount of data a user purchases. Verizon and AT&T are both charging a flat rate for a certain data level; consumers pay extra per line that will share the data.

AT&T's quarterly financial statement reveals that 5.1 million phones were activated in April, May and June of 2012, according to TechCrunch. Of these activations, the iPhone accounted for 3.7 million. 33 percent of iPhones activated were new subscriptions. AT&T's financial statement also revealed that 88 percent of postpaid customers are on FamilyTalk or business plans; one-third of postpaid AT&T customers use a 4G capable device.

Smartphones were 77 percent of postpaid sales growth and AT&T has about 43 million smartphones subscriptions, according to PC Mag. The same article pointed out that more Android devices than iPhones were activated on Verizon in the first quarter of 2011.

AT&T sales of the iPhone were even higher in the previous quarter, with 4.3 million units sold in January, February and March of 2012. 7.6 million iPhones were activated on AT&T in the last quarter of 2011. As TechCrunch points out, the iPhone 4S has been out for about nine months now, but many units are still sold. The Huffington Post reports that the best-selling smartphones of 2011 were Apple's iPhone 4, iPhone 3 GS and iPhone 4S.

Rumors say the iPhone 5 will launch in September with a slimmer design, new materials and a 19-pin dock pin connector, said an article in the Examiner.

Tags: Android or iPhone, AT&T iPhone, AT&T quarterly reports, best-selling smartphones, data charges, family plan iPhone, iPhone 4S, iphone market share, iPhone popularity, iPhone sales, mobile activations, mobile sales, new iPhone activations