Samsung's flagship smartphone Galaxy S3 is taking the market by storm. However, when compared to the iPhone in terms of usage among the U.S. users, it is still lagging behind.

According to ad firm Chitika, Galaxy S3 has given a boost to Samsung's sales figure since its launch in June in U.S. and the Korean smartphone maker's market presence has improved due to the launch of the fabled GS3 smartphone. However, the report notes that while the Galaxy S3 easily beats all leading and contemporary Android smartphones, it still loses the battle to Apple's iPhones.

Chitika Insights, to determine Galaxy S3's performance in the U.S. market, conducted a user agent analysis study on millions of mobile ad impressions spanning from June 18 - Aug. 5, 2012.

The study reveals that the S3 smartphone already represents 11.23 percent of all Samsung smartphone web usage. According to the study, Galaxy S3 "has quickly surpassed the Galaxy Nexus in activity, and is hot on the tails of other Galaxy S models. While the growth of its Web presence isn't quite as dramatic as its publicly available sales figures, it is likely that adoption of the device will continue to increase in the future as the holiday season approaches and Android aficionados upgrade their phones."

While the 1280 X 720 screen resolution, 2GB of RAM, and a 2100mAh battery of Galaxy S3 give the phone an edge over many Android phones, the device could not down iPhones' popularity, says Chitika. Even though Galaxy S3 is the closest rival to Apple's iPhone, it holds only 0.24 impressions per one iPhone impression seen over Chitika's network.

The ad firm, however, predicts that with Apple's potential launch of the next-generation iPhone in September, the Apple and Samsung rivalry will be "one of the most intriguing contests in the smartphone market this year."