The Samsung Galaxy S2, Samsung’s long-awaited flagship phone for 2011, is the 1st Samsung phone to be motorized by a dual-core processor. Galaxy S2 has continued its way since February when it was announced at Mobile World Congress in Barcelona. Galaxy S2, a best-selling phone of Samsung ever, will soon come to the United States after selling a record of 5 million units in just 85 days in Asia and Europe. But now other Android smartphone makers are giving a considerable competition to Samsung Galaxy S2 and trying their best to spoil this success. Google Nexus Prime, Motorola Photon 4G, Motorola Droid Bionic, HTC Vigor, and HTC Holiday are the top 5 Galaxy S2 competitors nowadays.