I don't see anythng more "sustainable" in this phone compared to mainstream ones. Making it a bit more modular or repairable does not make it "sustainable".
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I have many friends who never repair their phone: as soon as something is broken they buy a new one, because the repair price is often very high. With FairPhone, you get 5 years of warranty and after that you can repair it yourself at a low price.
If some people can repair their FairPhone instead of throwing their mainstream phone away, then that's a win.
Of course, warranty won't cover aged battery or damage (which probably are 99% of repairs) in any case.
What about changing the screen? Or USB port? Or camera? Or speaker?
> "Fairphone 5 battery" it comes at about the same price (£45 - £65) just to get the part.
45 is still cheaper than 69, and you don't need more than "getting the part" because it's trivial to change it yourself, right?