E911 is one of those rare, valid exceptions to the bill of rights. Do you think people should be able to falsely yell "Fire!" in a crowded movie theater too?
Plus, it's probably arguable as to whether or not your cell providers' location data on you constitutes a "search" or not. Unless E911 works by transmitting your devices' GPS readings from its own hardware to authorities, but even then I am not sure since they are doing so as a middleman. IANAL
Also, you might wait but I'm not sure that most folk in distress would agree with you.