Mobile development guidelines for iOS, Android, Microsoft

Apple (iOS)

• iOS Human Interface Guidelines or the PDF version (PDF 28.4MB, pp. 226)

Google (Android)

• Android User Interface Guidelines
• Motorola’s Best Practices for Android UI

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