1. A method of locating a mobile telephone, comprising the steps of: receiving at a base station a call from a mobile telephone, the call including a dialed number and a TDMA signal; transmitting from the base station to the mobile telephone a control message, in response to the dialed number meeting a predetermined criterion, the control message instructing the mobile telephone to transmit the TDMA signal at a maximum power; increasing the TDMA signal to maximum power in response to the control message; and determining location information for the mobile telephone based on at least one characteristic of the TDMA signal received at the base station.