Hi Aliki,
I bought the Fairphone 2 and I’m happy with.
I use it with Android, I do not feel confident enough to install an other OS (système d’exploitation) like Lineage.
The big difference with the OS is that Android (google) will know everything (your data are his business) and that Lineage is completely open source and won’t use your data.
The OS (système d’exploitation Android ou Lineage) is regulary updated. That’s an imortant point because the other don’t do that and you can quickly get a “young hardware with an old software”, which can provocate some lack in the security.
A complicated aspect could be that, with Lineage, you would have no access to google play and you would have to find your app on an other apps storage like F-Droid.
I can hear my mp3 without any problem and everything works fine.
The design is bulky and robust. You won’t break it so easily. If it happen you can repair it, the spare part aren’t so expensive.