E911cannot be turned off. It is required by the fcc:

http://www.fcc.gov/guides/wireless-911-services:

I searched to see if there was a hack to turn it off, very unwise if you have an emergency and can't get help, and you can't short of using a tin foil hat.

I use a find my phone app that if you text a code word will return your gps coordinates and the street address for the police. I use it to send my last known address when I'm playing in the woods. If you have a signal to make a call you can text yourself first or during the call to get more detailed info of where you are. It is also important to download the google map of where you are traveling so the street address can be found if you lose data.

This is my 100th post!!! After over 10 years of reading the forum I'm now officially a "member" :-)
Mods where should I send my address for my free toaster?