The phone is repairable and parts are mostly user replaceable, that’s why you are being downvoted. Sustainability starts with making sure you support the device with software and parts over time, not just ethical sourcing.

The main problem, consistently is the battery and fairphone makes it fully user replaceable. It sure as shit is much better than just exchanging the device or charging so much for repairs that it’s equal/cheaper for the user to get a new one(*cough Apple, Samsung…).