A location service system for locating a target mobile terminal, comprising: a client terminal (101, 111, 121) adapted to transmit a location request including requested accuracy and requested allowable age of the target mobile terminal; and a positioning system adapted to produce location information of the target mobile terminal; the location service system characterized by comprising: a gateway (102, 112, 122) adapted to transmit the location request to said positioning system and to store the obtained location information as last known location information of the target mobile terminal and a privacy profile of the target mobile terminal, wherein the gateway (102, 112, 122) is adapted to perform a first privacy check to verify the location request received from the client terminal with referring to the privacy profile of the target mobile terminal in terms of acceptability of the client terminal, the requested accuracy and the requested age in the location request, and is adapted to perform a reusability check to verify if the stored last known location information satisfies the requested accuracy and the requested allowable age in said location request, and if the reusability check is affirmative, is adapted to then perform a second privacy check on the stored last known location information, instead of transmitting a new location request to the positioning system, whether time of location estimation, estimated location and location accuracy of the stored last known location information agree with a time-zone and an area and an allowed location accuracy specified by the privacy profile of the target mobile terminal in order to decide whether said gateway can transmit the stored last known location information to the client terminal. a client terminal (101, 111, 121) adapted to transmit a location request including requested accuracy and requested allowable age of the target mobile terminal; and a positioning system adapted to produce location information of the target mobile terminal; the location service system characterized by comprising: a gateway (102, 112, 122) adapted to transmit the location request to said positioning system and to store the obtained location information as last known location information of the target mobile terminal and a privacy profile of the target mobile terminal, wherein the gateway (102, 112, 122) is adapted to perform a first privacy check to verify the location request received from the client terminal with referring to the privacy profile of the target mobile terminal in terms of acceptability of the client terminal, the requested accuracy and the requested age in the location request, and is adapted to perform a reusability check to verify if the stored last known location information satisfies the requested accuracy and the requested allowable age in said location request, and if the reusability check is affirmative, is adapted to then perform a second privacy check on the stored last known location information, instead of transmitting a new location request to the positioning system, whether time of location estimation, estimated location and location accuracy of the stored last known location information agree with a time-zone and an area and an allowed location accuracy specified by the privacy profile of the target mobile terminal in order to decide whether said gateway can transmit the stored last known location information to the client terminal. a gateway (102, 112, 122) adapted to transmit the location request to said positioning system and to store the obtained location information as last known location information of the target mobile terminal and a privacy profile of the target mobile terminal, wherein the gateway (102, 112, 122) is adapted to perform a first privacy check to verify the location request received from the client terminal with referring to the privacy profile of the target mobile terminal in terms of acceptability of the client terminal, the requested accuracy and the requested age in the location request, and is adapted to perform a reusability check to verify if the stored last known location information satisfies the requested accuracy and the requested allowable age in said location request, and if the reusability check is affirmative, is adapted to then perform a second privacy check on the stored last known location information, instead of transmitting a new location request to the positioning system, whether time of location estimation, estimated location and location accuracy of the stored last known location information agree with a time-zone and an area and an allowed location accuracy specified by the privacy profile of the target mobile terminal in order to decide whether said gateway can transmit the stored last known location information to the client terminal.