1. A method of estimating a position of a mobile terminal operating in a coverage area of a radio telecommunications network having a plurality of base station transceivers and a plurality of service area sectors, said method comprising the steps of: determining, for a plurality of positions throughout the coverage area of the network, expected Received Signal Strength (RSS) values of a signal transmitted by the base station transceivers and received by a typical mobile terminal; storing the expected RSS values at a plurality of locations in a database; obtaining, by the mobile terminal for which the position is to be estimated, RSS measurements of signals transmitted by the base station transceivers; comparing the RSS measurements obtained from the mobile terminal with the expected RSS values stored in the database; and estimating the position of the mobile terminal based on differences between the RSS measurements and the expected RSS values.