Update : Mobile Market Share

According to a recent survey by comScore, Android has increased its market share over the last couple months (November 2011- Febuary 2012).

In the USA, half of smartphone owners now own a Android, with a market share of 50.1 %, up from 46.9 %.
However, this does not come at the expense of Apple, which increased their market share to 30.2% from 28.7%.

This leaves two companies, being RIM with Blackberry and Microsoft with Windows OS.
Their market shares are at 13.4% and 3.9% , respectively.