My wife's iphone is full. I decided to free up some space by removing the photos. I connected iphone to PC and copied over complete photo collection. Then I disconnected the device and started removing each single photo by hand! Well, because you just can't select all and remove photos from your device in 2016 unless it is Android, Windows or Blackberry phone. So, after spending enough time to delete 1.5k photos by hand, I removed them from "recently deleted" folder only to see that the available space is 0 bytes. I restarted the phone. Tried to take a photo, no luck. The iphone refuses to take a picture because there is not enough space on the device. This is peculiar because I have zero photos according to "camera roll". So, now, I can't neither install an new app nor take photos, ffs Carl!
I am literally laughing while writing this because the question is so dumb simple I've never expected to ask. How to actually remove the photos from iphone to free some space?
This is iphone-4 with iOS 9.3.5. Some screenshots.