1. Useful, but not very effective.
2. Most of the time our old mobile phones will be recycled by some professionals, these people recycle mobile phones, mainly need the parts inside the mobile phone, such as display, battery and chip and so on. However, relatively backward machines are generally of no value, because the parts inside have been eliminated by the market, and many models of mobile phones on the market do not support these old chips, so there is no use value.
Chip recycling is good for the current situation, reducing e-waste, and it definitely works.