A system for handling a mobile emergency service call originating from an incognito mobile station operating in a mobile telecommunication network includes a mobile positioning center coupled with the mobile telecommunication network; an incognito call handling center coupled with the mobile telecommunication network; and an incognito phone data base coupled with the mobile positioning center. The mobile positioning center queries the incognito phone data base to ascertain handling instructions for the mobile emergency service call when the mobile telecommunication network fails to provide a call back number for the incognito mobile station to the mobile positioning center. The incognito phone data base, the mobile positioning center, the mobile telecommunication network and the incognito call handling center cooperate to effect routing of the mobile emergency service call substantially according to the handling instructions.