Replicant

https://www.shiftphones.com/en/ got nice results on https://www.ifixit.com/smartphone-repairability and also states

"We care about good working conditions, including fair wages and working hours. And of course we will not allow child labor in the production of your SHIFTPHONE. Beyond that, the conflict material coltan is not part of any device. It is also important to us to protect the environment as much as possible."

Processor: MT6797X Helio X27
OS: Android™ 8.0

We're drowning in eWaste, things like this could help.

Listed already at https://redmine.replicant.us/projects/replicant/wiki/TargetsEvaluation but with a bunch of ???s.