I bought a retro camera phone case online and put it on the iphone4, which blocked the sensor. The screen is always on when I make a phone call. What should I do?

I'll teach you a trick: change the handle cover yourself, take it off, prepare a needle, the thicker one is better, and then prepare a lighter. Wrap the perforated part of the needle in paper several times (to prevent scalding), then heat the other end of the needle with a lighter for about 10 second, stop heating, tie the heated part off the phone case (sensing position), and then shake it left and right, so that the sensing place will leak out, so that you can sense it, hehe, anyway, your phone case is not there.