Why does my storage data disappear on my iphone for no reason?

Yesterday i had 1 gig of free space and now today all i had was 400 mbs. Where is it going? I didn't download anything

Apple phones delete useless files off your phone to speed it up.

  • Will photos on iPhone disappear if low on storage? A big chunk of photos disappeared off of my iPhone 6s Plus. I took over 200 pictures from a family vacation to Orlando this past May, and while going back through my photos today, trying to make more room on my phone, over 200 of my photos (and also some videos) where gone. I don't know how long it has been like this, I just noticed it now. Does this have somthing to do with my phone being low on storage? Or is it somthing else?
  • Why does the volume bar on my iphone disappear and appear whenever it wants to? I have an iPhone 4. If I try and listen to music the volume bar goes away and when I try to adjust the volume with the + and - buttons the volume bar under "ringer" is gone. I've tried restarting my phone, fixing the settings, plugging in my earphones and cleaning where you plug them in and connecting my phone to my laptop but nothing seems to work.
  • Why does my iphone keep vibrating for no reason? My iPhone keeps vibrating like this: bzzz bzzz. I've no notifications or texts coming in so it's not that. Anyone know how to fix this or why it's doing this?
  • Why does my iphone keep vibrating for no reason? - 1 My iPhone keeps vibrating like this: bzzz bzzz. I've no notifications or texts coming in so it's not that. I have no apps updating too! Anyone know how to fix this or why it's doing this?