A wireless location determining system comprising: - A plurality of base transceiver stations, each configured to transmit wireless base transceiver station signals comprising a base transceiver station parameter and to receive wireless mobile phone signals each comprising a mobile phone parameter from a mobile phone; - A plurality of mobile phones, each configured to transmit the wireless mobile phone signals and to receive the wireless base transceiver station signals; - A location processing module connected to the base transceiver stations and the mobile phones by means of a communication network; and - A wireless device; wherein - The wireless device comprises a first beacon parameter formatted as a mobile phone parameter, and a wireless transmitter that is configured to transmit a first beacon signal comprising the first beacon parameter; and - The location processing module is configured to: - Determine a first range of possible locations of the wireless device in function of the connected base transceiver stations that detected the first beacon signal; CHARACTERISED IN THAT - The wireless device further comprises a second beacon parameter formatted as a base transceiver station parameter, and the wireless transmitter of the wireless device is further configured to transmit a second beacon signal comprising the second beacon parameter; and 25 - The location processing module is further configured to: - Connect to a plurality of mobile phones present in the first range; - Determine a second range of possible locations of the wireless device in function of the connected mobile phones that detected the second beacon signal, the second range being smaller than the first range. - A plurality of base transceiver stations, each configured to transmit wireless base transceiver station signals comprising a base transceiver station parameter and to receive wireless mobile phone signals each comprising a mobile phone parameter from a mobile phone; - A plurality of mobile phones, each configured to transmit the wireless mobile phone signals and to receive the wireless base transceiver station signals; - A location processing module connected to the base transceiver stations and the mobile phones by means of a communication network; and - A wireless device; wherein - The wireless device comprises a first beacon parameter formatted as a mobile phone parameter, and a wireless transmitter that is configured to transmit a first beacon signal comprising the first beacon parameter; and - The location processing module is configured to: - Determine a first range of possible locations of the wireless device in function of the connected base transceiver stations that detected the first beacon signal; - Determine a first range of possible locations of the wireless device in function of the connected base transceiver stations that detected the first beacon signal; - The wireless device further comprises a second beacon parameter formatted as a base transceiver station parameter, and the wireless transmitter of the wireless device is further configured to transmit a second beacon signal comprising the second beacon parameter; and 25 - The location processing module is further configured to: - Connect to a plurality of mobile phones present in the first range; - Determine a second range of possible locations of the wireless device in function of the connected mobile phones that detected the second beacon signal, the second range being smaller than the first range. - Connect to a plurality of mobile phones present in the first range; - Determine a second range of possible locations of the wireless device in function of the connected mobile phones that detected the second beacon signal, the second range being smaller than the first range.