The important thing to remember when deciding what information to store on the mobile device is that it should be essential. In general, this means information that a user will access regularly or will urgently require in certain situations. Of course, different people have different needs, so you certainly want to keep your audience in mind as well. It is also advisable to let users customize their content when possible. User preferences can be handled with cookies in the same way that this is done in desktop Web design.