The Galaxy S II is probably the strongest rival to the iPhone.

It runs on Android 2.3, has a 4.3-inch display, a dual core processor, 1GB of RAM, an 8-megapixel camera and a superthin design. Although it hasn’t been available in the U.S., the Galaxy S II sold a record in just 55 days, which is in part due to Apple holding back the launch of its next-generation iPhone.

Samsung a press event on Aug. 29, where it is expected to spill all the details about the U.S. arrival of its iPhone competitor.

In the U.S., Samsung is likely to continue its strategy to sell the same smartphone barebones slightly repackaged for each large wireless carrier.

The Galaxy S II is rumored to sport a sliding QWERTY keyboard when it as the Attain and on Sprint it’s expected to have 4G WiMAX connectivity under the name.