

I use it as a dim light at night when I go to the loo, instead of blinding myself with the flash.
Also it’s a volume indicator which is occasionally useful.
Also, if you care, when people notice the back of my phone light up they comment on it because that isn’t normal. (2a)
My car has a spot to put the fob if the fob is dead, and it’ll just read the dead fob and be fine.