iPhone: Where NSUserDefaults get stored?

The physical path is rootOfApplication/Library/Preferences/com.yourcompany.appName.plist you can see there if you test it in simulator

• Connect Your device to Xcode.
• Select Windows -> Organiser.
• Select your device.
• Click on your application.
• Click the gear icon and Download Container….
• Select the downloaded .xcappdata file, right click and select Show Package Contents.
• Open the AppData folder.
• Navigate to Library -> Preferences -> appbundlename.plist.