If you go for used devices, you can quite easily get an outdated entry level phone for free and a decently useable one for <€30.
You can even get new entry level phones for as cheap as €70.
So it's very much a market where you can spend whatever you want.
A flagship phone is priced like a luxurity toy, because that's exactly what it is.
And an entry level phone is incredibly cheap so that people who have no money can still get one. €70 with 2 years of usage is less than €3/month (realistically though, if you are in this kind of situation, you hold on to a phone for much longer).
Over here, if you are poor enough, you'll even get a free phone plan.