Apple (iOS)
- iOS Human Interface Guidelines or the PDF version (PDF 28.4MB, pp. 226)
Google (Android)
Microsoft (Windows Mobile, Windows Phone)
- UI Guidelines for Windows Mobile
- Guidelines for Touch Interactions
- Guidelines for Windows Runtime Apps (Windows and Windows Phone) or the PDF version (PDF 9.7MB, pp. 447)
BlackBerry, Nokia, Palm/Hewlett Packard (webOS), Sony Ericsson, and Others
- UI Guidelines for BlackBerry 6.0 Smartphones or the PDF version (PDF 9.2MB, pp. 107)
- BlackBerry Browser Content Design Guidelines (PDF 356KB, pp. 29)
- Nokia X Design Guidelines
- Nokia Lumia Design Portal
- Hildon User Interface Style Guide
- webOS Human Interface Guidelines
- Sony Ericsson UI Rulebook
- Bada Application UI Guide
- Tizen UX Guide
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