Strategy Analytics, a research company that tracks the mobile phone sales in US, revealed that Apple’s ultimate gadget, the iPhone, has become AT&T’s top selling device in Q3.

Apple released the iPhone on June 29 and according to the data announced by AT&T in July in only two days the company has activated 146,000 of the phones. More than 40 per cent of those users were new AT&T customers, AT&T added.

Also last month the research firm iSuppli said that in its first month of presence on the market, the iPhone accounted for 1.8 percent of all mobile handset sales in the U.S, meaning that more than 220,000 handsets have been bought during summer’s hottest month. iSuppli’s data has been gathered based on a survey of more than 2 million U.S. consumers. On September 10 Apple officially announced that one million iPhones were sold in only 74 days. Now Strategy Analytics has offered a new estimation.

The company said that, based on the data form is ProductTRAX program nearly 1.1 million units were delivered to US consumers through the combined AT&T and Apple outlets during Q3, totaling 1.325 million units since the iPhone launch.

“The iPhone has become AT&T’s top selling device, commanding some 13 percent of AT&T’s overall handset sales, and the 4th top selling handset in the US market,” according to Barry Gilbert, VP of the Strategy Analytics BuyerTRAX programs.

Streategy Analytics predicted that the iPhone could make it the top selling device in the US over the next 1-2 quarters. Currently Motorola’s RAZR V3 continues to be the top selling handset in US.

Strategy Analytics also revealed some data about the iPhone users. According to their report, the largest percentage of iPhone buyers is between 20-30 years old, but the Ultimate phone is an attractive gadget for older people. 25 percent of iPhone buyers were between 50-60 years, said Strategy Analytics.

In order to boost the holiday sales of iPhone, Apple announced last month a $399 price tag for the 8 GB version, instead of the initial $499 price.