AT&T and Apple have sold 1.325 million iPhones, according to Strategy Analytics, making it one of the most popular mobile devices in the United States.

“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.

“Although the iPhone hasn’t had an expansionary impact in the market, the iPhone has quickly assumed a leading market share position and raised the ante for smart devices,” according to Mr. Gilbert. “The sales trajectory we are observing with the iPhone could make it the top selling device in the US over the next 1-2 quarters.”

The trend is especially important to the world of new media, because the iPhone opens up new audiences to podcasts, video podcasts, YouTube and other Internet media. The success of the device is also likely to lead to more capable mobile clients that can handle portable media.

The top selling handset in the US continues to be Motorola’s RAZR V3, however, it appears to be losing momentum to new and more competitive models.

iPhone Users An Extremely Attractive Demographic

“The typical iPhone buyer is upwardly mobile, college educated with a six-figure household income,” according to David Kerr, Vice President of the Strategy Analytics Global Wireless Practice. “While the largest percentage of iPhone buyers is between 20-30 years old, the fact that nearly 25 percent were between 50-60 years old demonstrates that the device attracts buyers across a broad age spectrum.”

According to SA’s research, iPhone users are quite satisfied with phone design and features. However, they are less enamored of the iPhone’s reliability, battery life, documentation and customer support.