By default, if you run the Blank App (Xamarin.Forms Shared), there is a WINDOWS_PHONE compilation symbol and a ANDROID compilation symbol, but there is no IOS compilation symbol. The WINDOWS_PHONE symbol is defined in the WP project, but I don't know where the ANDROID symbol is defined. However, there isn't a IOS symbol defined anywhere, because code inside a #if IOS block isn't executed.
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