Since 2019 it has become apparent that many people have not been properly prepared for Expo.
This is what you need to do:
Phones assume that you are walking along streets, or running along tracks or cycling. They are very bad at making the right guesses for the Totes Gebirge plateau.
Do not select the "high accuracy" location setting on your phone. Mostly this will snap your position to the nearest cafe or bierstube: by default it will use the nearest WiFi it can find and assume that you are there, and will ignore the perfectly reasonable GPS position it has recorded directly.
This is all explained by Google here.
On the plateau, this "high accuracy" mode will simply give you the wrong position if it can't get a decent GPS fix. There is poor cell tower reception too, so trying to use that for location is just as bad.
What you want is GPS and only GPS (more precisely GNSS: which includes GPS, Glosnas, Beidou, Galileo etc.).
If you do not have a good GPS fix, you want to know that, not be given some confabulated guesstimate by whatever some programmer for Apple or Android thought your might want.
When you share photos on your phone to the Expo photo sharing site, by default, the location of those photos will be stripped out. So all those lovely pics of intriguing cave entrances you snapped on your walks are now utterly useless.
So, before expo, perhaps while sitting in a traffic jam around Munish or on the train from Bad Ischl, take a moment to photograph your travel companions in an embarassing pose and fix the this: