On March 2, 2011, at the iPad 2 launch event, Apple announced that they had sold 100 million iPhones worldwide.[296] As a result of the success of the iPhone sales volume and high selling price, headlined by the iPhone 4S, Apple became the largest mobile handset vendor in the world by revenue in 2011, surpassing long-time leader Nokia.[2] While the Samsung Galaxy S II proved more popular than the iPhone 4S in parts of Europe, the iPhone 4S was dominant in the United States.[297] By 2012, the two-year-old iPhone 4 had outsold the original iPhone, iPhone 3G and iPhone 3GS models put together.[298]