This is a great article and explains just how difficult it is to create an ethical smartphone: "Fairphone, however, decided to stick with supplies from the country, working with the Conflict Free Tin Initiative and Solutions for Hope. It did so knowing that sourcing its tantalum and tin from the DRC could mean using mines with poor working conditions or child labour. Many other tech companies have opted to use minerals from conflict-free areas like Australia, which means they meet their Dodd-Frank obligations, but has caused the bottom to drop out of the mineral market in the DRC, which is unlikely to lead to an easing of conflict in the region.
"We said, we're going to join initiatives that put economic perspectives into the region, otherwise people will join the militia because they don't have any work any more," van Abel said." Definitely worth reading.