IOS 7.1 iphone 4

[iMore Question]

Anyone else having issues with the screen going blank afer ending a call and taking some time to come back.? cant press the call end button because i cant see it. Looks like the proximity sensor . this ony occured after i updated to ios7.1 this morning

 

[Jaguarr40]

Either reboot your phone or go into iTunes and set it up as new or if you know how to to use DFU Mode

http://forums.imore.com/guides-how-articles/258950-guide-how-put-device-dfu-mode-restore.html
Hook up to iTunes and it will recognize recovery mode and should resolve your issue