Hey Joel! Of course I can’t talk for all smartphone manufacturers, and indeed the screen is the part that breaks the most, but there are also other parts that tend to break a lot… unfortunately! Here are some:
- The usb connector
- The camera
- The microphone
- The vibration mechanisme (although this one you don’t see so much, it’s mainly the upper ones!)
Battery performance differs per phone as well, but usually they tend to perform worse after around a year or 400 cycling charges - at least that is how it is for Fairphone 1, for Fairphone 2 we will have to see, it is not a year old yet 
In any case, the modularity of FP2 is gonna be a great help when it comes to repairing commonly breaking parts. We have just set up the whole logistics plan for sending around modules and we are sending them throughout the whole of Europe now! A challenging mission to manage, I can assure you…
Thanks for submitting a question!