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
Open Xcode --> Go to Window (from menu bar) --> Devices and Simulators --> Click on Simulator --> Right-click on the simulator that you want to delete --> Click Delete
To delete any unwanted simulators that you installed in the past as an extra Component through Xcode.
Open Terminal
Type open /Library/Developer/CoreSimulator/Profiles/Runtimes
Delete undesired simulators