I have an iPhone 5 that is perpetually hovering near capacity. I came across a tutorial online suggesting backing up then restoring your iPhone to free up all the “Other” space being taken up on the phone — in my case, around 2 GB.
Don’t do it. What that author failed to understand/mention is that the Other space includes all the files cached by your apps. So it’s a space gain only until you realize you’re missing all your podcasts, books, etc. and have to download them all again.
Specifically I noticed losing all my local data in Overcast (podcasts), Audible, Kindle, NewsBlur (RSS reader), and my various email and calendar apps…so pretty much everything I use regularly. After opening them up again, I’m back to square one in terms of lack of space.