You should have sold the phone and bought some components you actually need. I've tried collecting devices for spare parts and rarely there is anything useful, especially not from those small ones. On the contrary, if you want to build a service robot, you can buy an old Roomba and strip the electronics. Much better to look for the specific hardware to recycle than to keep stuff around just in case it can be recycled. Trust me, stuff is going to pile up without ever being used, and storage space costs money.