Bought my first second-hand phone about a year ago! A Samsung one.
Bought it from a finnish phone store. My guess would be - someone ditched their phone after the screen broke and they fixed it and put it to sell. It was 100-150€ (before I bought new phones for 600+€) Its tech was much better than my previous phone’s, including the battery life 😂
The only problem I have been experiencing is some touch screen problems - it’s almost as if a ghost starts to use my phone once in a while when I activate the screen. Usually closing and reopening the screen makes it go away. New updates might also affect positively/negatively on this challenge. But I’m still happy with my phone!