The invention provides a telecommunications system, adapted to optimise utilisation of bandwidth when menu-based value added services are offered to subscribers via narrow band radio channels of the system. The system comprises a telecommunications operator's server adapted to communicate with a plurality of mobile telephone terminals, at least one service provider's server and data storage means. The operator's server is adapted to download a menu-based value added service, together with a unique identity for said menu-based value added service, to a mobile telephone terminal in the form of a data structure, instead of an executable code. The data structure provides the means by which a tree structure can be unambiguously described. The system is adapted to make available a function for creating unique identities for all menu-based value added services, and an unambiguous algorithm for application to said menu-based value added services, which results in different menu choices, directly coupled to a service call, being assigned different menu choice references.
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