I've been invited to give feedback to all Parsons students, regarding your thesis projects.
You've done a very nice job of targeting a niche market and making responsible consumption both desirable and attractive. I especially appreciate your consideration of recycling components from obsolete phones! This is proof of systemic thinking, which is critical when endeavoring to solve a problem with a sustainable solution.
I'm curious to see how you might design a system, as you suggest, to reduce the loss of mobile phones, keeping them out of the landfill. Once you've nailed both, then you'll be successfully addressing both existing waste and eliminating future waste.
Keep up the good work, J.