First of all i am very thank full of your critique.

I do not think it could be a problem for emergency calls.. If you open the app menu you will not only see the icon but also a text describing it. Also the power menu do not use an icon just the text "phone".

That was one of the first icons i made thus it is a lot of work behind it. It took some time before i got it right and had to remake it a couple of times. So i will not change it in the package.

It is fairly easy to manually change it though.