It's interesting that you say that, since it was one of my favorite parts about Europe being able to just walk up to any main street corner and have a ride somewhere. No need to have an app or anything, always works, no privacy/data issues. And it was never a big deal to walk a couple blocks to the main roads
When I went to Paris I was cheated so much and almost beaten, had a physical altercation with a taxi driver at destination. Never again would I use taxi if I have another option.