Please note that as of October 24, 2014, the Nokia Developer Wiki will no longer be accepting user contributions, including new entries, edits and comments, as we begin transitioning to our new home, in the Windows Phone Development Wiki. We plan to move over the majority of the existing entries over the next few weeks. Thanks for all your past and future contributions.
I would add that comprehensive icons are always better: takes less room, does not need to be read, give consistency between application. when using icons, be sure to be coherent, and to use well known metaphors.
The main function of Tabs is to move between different views. Tab is one of the basic element for User interface in Symbian.
This article describes general and simple rules that should be kept in mind during designing tabs in your application. The rules are very well-explained with image implementations. This article is specially meant for beginners. Beginners can also refer Custom tabs to make the tabs more attractive in their application.