i have too many in my xCode application
i try to delete but just a moment its back to device list
how to remove it.
xcode Version 6.4 (6E35b)
Quit Xcode and the Simulator, and say (in the Terminal):
$ xcrun simctl delete
That will delete them all and now you can start fresh. It's good to do this from time to time...
BLC
It may happen because of multiple Xcode installed or during Xcode upgrades. The only thing that need to be done is to open Xcode -> Window -> Devices select duplicated device and delete it.
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来源：https://stackoverflow.com/questions/33359127/its-too-many-simulators-in-xcode-6-4