Emergency mode also enables what's called E911. Its a nifty little feautre that uses brute force to force your phone to turn on GPS and if your call is lost, for whatever reason, the location of the phone is sent to the dispatcher. Its a huge safety feature, and there's no way to turn it off. I would be worried my phone couldn't dial 911, but I would report this to the dev of the app. He might shed some light on it.
Sent from my Banana Phone