You can turn off the shutter noise your iPhone camera makes by flipping the Ring/Silent switch to Silent or enabling the Live ...

When you're sure nothing is blocking your iPhone's camera, you can fix it in 6 ways when it has a black screen. Try them and see what works.

A diagram of the material developed using on-axis magnetron sputtering. By applying a current through the platinum material on top of the TmIG, researchers were able to reverse the magnetization ...