Trying to remember the exact spelling and format of the ios-sim emulators can be difficult.
Run the following command to list them.
./platforms/ios/cordova/lib/list-emulator-images
#=> Output
#iPhone-4s
#iPhone-5
#iPhone-5s
#iPhone-6-Plus
#iPhone-6
#iPad-2
#iPad-Retina
#iPad-Air
#Resizable-iPhone
#Resizable-iPad
Then emulate a specific device like so
cordova emulate ios --target="iPhone-4s"
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