Features currently not supported by Unity iOS

Graphics

DXT texture compression is not supported; use other formats instead. Please see the Texture2D Component page for more information.
Rectangular textures cannot be compressed to PVRTC formats.
Movie Textures are not supported; use a full-screen streaming playback instead. Please see the Movie playback page for more information.

Scripting

Dynamic features like Duck Typing are not supported. Use #pragma strict for your scripts to force the compiler to report dynamic features as errors.
Video streaming via WWW and WebRequest classes is not supported.
FTP support by WWW and WebRequest classes is limited.

Features restricted to Unity iOS Pro License

Splash-screen customization

External libraries

It is recommended to minimize your references to external libraries, because 1 MB of .NET CIL code roughly translates to 3–4 MB of ARM code. For example, if your application references System.dll and System.Xml.dll then it means additional 6 MB of ARM code if stripping is not used. At some point the application will reach this limit and the linker will have trouble linking the code.

2018–06–14 Page amended with limited editorial review

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Managed stack traces on iOS

Troubleshooting on iOS devices