I\'m running Xcode 4.3.1 iOS-Simulator which originally only supports iOS 5.1.
I need to test my code with iOS 4.3, so I used Xcode\'s \"Install\" feature to install
Command+Space
Type 'simulator'
open the old beta simulator you no longer need.
right-click on it in the dock, then choose Options>'Show in Finder'
Close the app, then remove it from the folder.
:)