On Thursday (Feb. 23), Samsung announced that it managed to sell over 20 million Galaxy S2 Android smartphones. The Galaxy S2 which first went on sale in April 2011, has become Samsung’s most successful Galaxy device to date. Hence, the big question – should iPhone 4S be afraid?

Galaxy S2 is a successful device, no doubt, but its success pales in comparison to the over 20 million iPhones Apple is able to sell every quarter. Samsung has only managed to push its 20 million during a 10 month period, and while the sales have improved when compared to the original Galaxy S, it is still not ready to compete directly with the Apple iPhone 4S.

Samsung’s announcement came as no surprise. With the high amount of lavishing reviews the Galaxy S2 has gotten over the last 10 months, there is no denying the fact that the Galaxy S2 was and is still the best Android smartphone out there. The device comes packed with a beautiful 4.3-inch Super AMOLED display that is able to showcase pictures and videos with high clarity and sharpness, which is lacking from most smartphone displays. On top of that, the Samsung Galaxy S2 also packs a super-fast 1.4GHz dual core processor, an 8-megapixel rear-facing camera, 2-megapixel front facing camera for video calling, and a built-in memory that begins at 16GB and goes up to 32GB.

Galaxy S2 is truly a powerful device, and perhaps more powerful when compared to the iPhone 4S. However, having said that, we don’t believe the iPhone 4S has anything to fear despite the growing popularity of the Galaxy line of smartphones. The iPhone 4S alone managed to help Apple gain the much needed market share in 2011 and this is due in part to the new hardware upgrade which saw the iPhone 4S sport a dual core processor, and an 8-megapixel camera.

The best thing about the iPhone 4S, however, is Siri - another reason why the iPhone 4S will more than hold its own against the Samsung Galaxy S2. Powerful hardware alone is not the key to success. A marriage of powerful hardware and superb software is the way to go, and from what we have seen, the iPhone 4S is above the Galaxy S2 in this department.

(Reported by Vamien McKalin, edited by Wendy Li)