Remove Unwanted Simulators(that appears with UDID) from Xcode

You may have noticed sometimes while working with Xcode that our simulator get lost in the crowd of some unwanted simulators

This has started appearing with Xcode 6 and removing individual simulators will be a big deal because there are many such duplicates.

Perform this simple steps and you will be free from all your headaches.

Open Terminal

killall Xcode - Kills all running Xcode processes.

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService - Kills all running CoreSimulatorService's processes.

rm -rf ~/Library/Developer/CoreSimulator/Devices - Removes all Simulator data, from all the Simulators.

open /Applications/Xcode.app - Opens Xcode.

Happy iCoding

Source: SO