The Samsung Galaxy S2 has finally set foot in the U.S., on AT&T's network for $200 with a two-year contract.

The Galaxy S2 debuted back in February at the Mobile World Congress in Barcelona and the phone was later launched in Europe and South Korea.

It has a 4.3-inch Super AMOLED Plus touch screen measuring 480x800 pixels, a dual core 1.2-GHz processor, fast 4G network connectivity and a sleek and simple design. The Super AMOLED Plus display is bright and vivid and surprisingly crisp given the relatively low resolution

Earlier, Samsung had announced that it has already sold more than 10 million units of the Galaxy S2 smartphone since its launch in April. However, the jury is still out on whether that means it has shipped those units to retail stores or actually sold them to customers. The new device was released in South Korea on April 29 and in some European countries in May. It also went on sale in China in July before hitting the U.S. market in September. According to reports from the company, 3.6 million units have been sold in South Korea, followed by 3.4 million in Europe and 2.3 million across the rest of Asia.

The sales rate, however, pales in comparison to that of the iPhone 4, which hit 1.7 million in three days. Nevertheless, in recent times, Samsung has become the biggest competitor for Apple's iPhone. Samsung and Apple are at loggerheads in a series of patent lawsuits over the technology and design of their smartphones and tablet computers.

Iphone Smartphone China Retail