Smartphone dialing 911 even when Locked?

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Modify the regkey HKLM\Security\ECall with your fav reg editor. 

It is a multi-Value string with the default values of 911, 112, 08, and 999.  Just remove the ones you do not want to be called.

If you are getting an error (like Error: unable to perform this operation) when attempting to modify this regkey try installing this cab (which will just remove 911 from the list above).

https://www.mikepoulson.com/blog/downloads/911.cab

Info from https://www.modaco.com/TotW_Changing_Emergency_Call_Numbers-t208117.html