I’m traveling to Barcelona and when I leave the train and walk on the platform I receive a notification from Cabify (Like Uber/Lyft) referencing the station where I am.
I only gave permissions of location only when using the app, and I did not used it in months.
How is it possible?
Your public IP is the one of the closest cell tower, but thats only enough to narrow it down to a city/neighbourhood. So probably by scanning the nearby wifi networks if it has network permissions.
It's not like that for me.
I was in another country recently (not neighbouring mine, there were 5 other countries in between)
And when on mobile data my ip location was the location of my telco, back in my home country.
Highly doubt your address is static across carrier infra across countries.
You can doubt all you want, but I'm just telling you exactly how it is. I checked it in multiple ip location check services. They gave me an IP that was geolocated to my telco providers city.