A method and system adapted for use in a mobile telecommunication network is described. The invention describes a rating and routing system which is adapted to enable an efficient rating and routing of data transactions being transmitted through a network. Based on a comparison of identifiers associatable with a subscriber to the network, with a set of parameters defined for data transactions, the system of the present invention is adapted to enable an accurate assessment and allocation of the correct rating tariff value to a specific transaction and the routing of that rated value to an appropriate destination defined for the user.