| 01 | Android | An Open Source mobile device operating system originally developed by Google and supported by the Open Handset Alliance | 10 | |
| 02 | BlackBerry OS | A proprietary operating system supplied by Research In Motion for its BlackBerry handheld devices | 10 | |
| 03 | iOS | A proprietary operating system based on Mac OS X supplied by Apple for its iPhone, iPad and iPod Touch handheld devices | 10 | |
| 04 | Linux | An operating system based on the Linux kernel | 10 | |
| 05 | Mac OS | Proprietary ‘Classic’ operating system supplied by Apple on Macintosh computers up to 2002. Deprecated – use code 13 for all Mac OS versions | 10 | 11 |
| 06 | Mac OS X | Proprietary ‘OS X’ operating system supplied by Apple on Macintosh computers from 2001/2002. Deprecated – use code 13 for all Mac OS versions | 10 | 11 |
| 07 | Palm OS | A proprietary operating system (AKA Garnet OS) originally developed for handheld devices | 10 | |
| 08 | webOS | A proprietry Linux-based operating system for handheld devices, originally developed by Palm (now owned by LG) | 10 | |
| 09 | Symbian | An operating system for hand-held devices, originally developed as a proprietary system, but planned to become wholly Open Source by 2010 | 10 | |
| 10 | Windows | A proprietary operating system supplied by Microsoft | 10 | |
| 11 | Windows CE | A proprietary operating system (AKA Windows Embedded Compact, WinCE) supplied by Microsoft for small-scale devices | 10 | |
| 12 | Windows Mobile | A proprietary operating system supplied by Microsoft for mobile devices | 10 | |
| 13 | Mac OS | A proprietary operating system supplied by Apple on Macintosh computers | 11 | |
| 14 | Windows Phone 7 | A proprietary operating system supplied by Microsoft for mobile devices, successor to Windows Mobile | 12 | |