BBC Mobile Services should be...
Immediate, Scannable, Concise, Considerate of context, Focused, Clearly navigable, Responsive.
You should also consider the following:
Mobile phone screens show only a small portion of the page. Aside from index pages, it is best to keep the 'one story per page' rule. Placing multiple articles on one page could lead to subsequent content being missed by the user.
Be judicious with the amount of content, particularly the number and size of images displayed. Long download times lead to people navigating away before the page has loaded.
Remember that mobile web users are likely to experience distractions due to their environment. They are also likely to want information that is useful at their location.
A busy environment or bright lighting conditions can make it difficult to pick out links or fields that are in focus.
Even though most recent phones have advanced text entry, allowing users to input information by making simple selections instead of entering text is preferable.
Make sure that the content is in the right order and the page can adapt to various screen types and widths. This is important especially for devices that can be used both in landscape or portrait modes.
When designing for BBC mobile platforms we recommend designing for 320px width and 240px width resolutions. Screen sizes and resolutions can vary across the same mobile platform.