Emergency number 112 for mobiles

My kids are told this at school that you can call 112 from a mobile on any network, even if you are outside mobile range.

Now, in the RACQ magazine , an article reads that if you are “…out of mobile range” you can call 112 from anywhere.
This is not the case! Articles like this create the urban myth, and a belief by some that all you need if you venture on our outback roads is a mobile and that you don’t need a sat-phone or other emergency communication. Indeed my 15yo son believed what he was told at school no matter what I (only dad) said. The only way was to show him. We testing it on a recent trip to Cape York. No connection. – message came up “no signal”

As I understand it, if you are out of mobile range then you cannot connect to any signal, whether you are dialling 112 or any other number. Articles like this may well lead to a serious situation where people rely on mobile phones for emergency contact on their outback adventures
CJ