FoxFi does work on the G4 but for some reason you can not use Knock Code, Swipe, or None for your lock screen. FoxFi greys them out.
I had Knock Code already set but had to turn it off to use FoxFi. So now back to Pattern Lock.
I had Knock Code already set but had to turn it off to use FoxFi. So now back to Pattern Lock.