Pretty much, that is.
http://www.ubergizmo.com/2013/04/microsofts-windows-phone-platform-gains-market-share-in-the-us-android-now-commands-over-50/
Android breaks 50%
IOS falls 3%
Windows Phone rises seemingly all at the expense of Blackberry, which falls below 1%
http://www.ubergizmo.com/2013/04/microsofts-windows-phone-platform-gains-market-share-in-the-us-android-now-commands-over-50/
Android breaks 50%
IOS falls 3%
Windows Phone rises seemingly all at the expense of Blackberry, which falls below 1%