Abstract: The position of a mobile station in a cellular mobile telephone system, particularly a GSM system, is determined by carrying out a simulated call setup, i.e., the call setup is interrupted subsequent to a telephone switching center (MSC) having received a paging response containing the identity of the cell and, optionally, a timing advance. The simulated call setup is initiated by generating a modified short message signal (SMS) which is not registered in the SMS catalogue of the mobile station and which is not shown to the user of the mobile station. The SMS commands the mobile station to carry out a position determining sequence in order to establish parameters for use in establishing the position of the mobile station, for example by commanding the mobile station to connect itself to a base station contained in its neighbor list, analyze the geographical position of the base station, and subsequently send the position determining parameters to a position handler.

Abstract: A digital mobile communication system comprises a switching center (MSC), a subscriber register (HLR) connected thereto, mobile terminals, such as mobile telephones, and subscriber-linked subscriber's cards, such as smart cards. Each subscription is allocated a subscriber's number and at least two subscriber's cards adapted to be activated so as to open a mobile terminal to incoming as well as outgoing traffic when inserted therein. When one of the subscriber's cards is activated, the other card or cards are necessarily deactivated so as to open a mobile terminal only to outgoing traffic when inserted therein. The subscriber register (HLR) is adapted to control the activation and the deactivation of the cards by the order of the subscriber.