Originally Posted by rawfa
So all of the sudden my wife's GS4's camera won't focus anymore. I've tried on the stock camera app and on instagram and neither work. I tap the focus square and it doesn't try to focus. By looking at the camera's glass it doesn't seem broken or anything. Also, the secondary camera is working.
It seems that the camera is broken, You can try to replace a new S4 rear camera.
What 's the version of your S4? The cameras for S4 have several versions. Don't get the wrong one.