回答先: iPhone 5c Proximity Sensor Not Working After Screen ReplacementCORRECT FIX!! On the original screen, there would have been a white square sticker that you are meant to swap out when changing screens, on all black iphone screens i might add. Its about 2mm x 2mm in size. If you have lost this then you can use PTFE tape. just cut 2mmx2mm square out witha scalple .