Just over half a decade ago, the smartphone landscape in the United States looked absolutely nothing like it does today. Companies like Microsoft (MSFT), BlackBerry (BBRY) and Palm (RIP) dominated the market in the U.S. and even Symbian had a healthy share in 2005. A major shift began in 2007 when Apple (AAPL) debuted the iPhone, and any hangers-on were quickly dispatched over the coming years after Google (GOOG) unleashed Android. We all know the story, but a picture is worth a thousand words and comScore issued a great chart during its recent “Mobile Future in Focus” webinar that shows just how quickly and decisively iOS and Android took over the U.S. market. The chart follows below.