Every now and then I place the phone next to the tray of parts. Could be why I sometime find random parts when sweeping the floor. I also find the parts to be a bit magnetic.
On the other hand the phone case can be used for finding parts. One just has to remember to run them through the demagnitizer.
The worse thing is when the tweezers stick to the phone case. Ironic that the third party cases are designed to work like a flip phone.
(and here I was hoping someone would suggest what clip on corrective optics to use for adjusting the depth of field. I have on the other hand been prefering the iPhone to the canon EOS. Mostly because I do not have a good macro lens with a 7CM focal distance that will fill the whole frame.)