We've just gotten data back from our most recent US Omnibus Survey, fielded in October and November of 2009, and it provides a snapshot of the US mobile phone market pretty darn close to the end of 2009. Before examining the data, it's important to note that the term smartphone, while widely used, doesn't benefit from a uniform, industry-wide definition. For Forrester, a smartphone is a mobile phone or connected handheld device that uses a high-level operating system, including iPhone OS, BlackBerry OS, Windows Mobile, PalmOS, WebOS, Symbian, and any flavor of Linux including Android.