Just before the iPhone 5's rumoured autumn release, one of its main rivals, the Samsung Galaxy S II seems to be achieving impressive sales, with more than 6 million units sold in less than three months, Digital Versus reports.

Just earlier this month, the company had announced 3 million units sold in just 55 days, and now it's smashing its own record, with this staggering 6 million figure.

With the US release of the Galaxy S II scheduled for this summer, and an expected number of 10 million units to be sold before the end of the year, the S2 should surpass the original Galaxy S sales of 14 million devices, in less than one year.

The Samsung smartphone seems to be doing just fine in the ferocious smartphone sector, being a strong competitor not just for the current iPhone, but also for the soon to arrive iPhone 5. Announced in February, the Android device features, among other things, a 4.27-inch Super AMOLED display with 800 x 480 resolution, dual-core Samsung processor, 8-megapixel rear-facing and 2-megapixel front-facing cameras.

At the moment, there isn't much competition on the smartphone market for this fine Android phone, with just the HTC Sensation, Motrola Atrix, Sony Ericsson Xperia Arc and LG Optimus 2X in its league.

We'll see what happens when the long awaited iPhone 5 comes, but considering its high-tech features and a likely drop in price by then, the success of the Samsung Galaxy S II won't be going down too soon.