Criteria
- have security features to deter theft
- have personalised functions and features
- increased social networking functionality
- incorporate more enhanced ‘level 3′ features such as dynamic time table, blogging etc…
With increased funcationality a more sophisticated hardware and software solution is required. One can invisage an Iphone style arrangment. With GPS tracking and RFID tagging to deter and trace theft and ownership.

A more sophisticated interface as seen in other devices targeted at this age groupe would be appropriate. For example the Sony PSP/ Sony Ericsson interface.

Taken from ‘Designing for Small Screens’
“The PSP’s main menu interface is the “XrossMediaBar” (XMB) used by recent Sony TVs, the PSX (DVR) hardware, and the PlayStation 3. It consists of a horizontal sequence of icons, in this case Settings, Photo, Music, Video, Game, and Network, which show a vertical sequence of sub-icons when highlighted.
The XMB allows the user to adjust settings, connect the device to a PC (via USB), connect to and browse the Internet, and play video, audio, and games. The XMB may be accessed at any time by pressing the Home button” – Wikipedia
Teenagers may be able to relate to more familiar interface that has already been implemented in popular consoles and adopted phone handsets.