A method of calling an elevator car for an elevator system including: transmitting, using a first beacon, a first poll wireless signal, the first poll wireless signal having a first poll transmission speed; receiving, using the first beacon, a first response wireless signal from a passenger mobile device in response to the first poll wireless signal, the first response wireless signal having a first response transmission speed; determining a first time of flight between transmission of the first poll wireless signal from the first beacon and receipt of the first response wireless signal at the first beacon; calculating a first distance between the first beacon and the passenger mobile device based on the first time of flight, the first poll transmission speed, and the first response transmission speed; and determining a location of the passenger mobile device based on at least the first distance.