iPhone 5c storage always full, even after reinstalling apps, why?!

Have you deleted all the photos and videos in your recently deleted album in the Photos app? That takes up space on the phone as well. There is also a random trick on that as well. If those photos and videos aren't deleted from there in a certain amount of days, they don't show up but they still take up space. What you could do is go to the settings and disable the time from being set automatically and set the time yourself. On the date, you want to go back as far as possible but I'm not meaning like decades. Set it to like 2012 to be sure since the 5c came out in 2013. Once you do that, go to the recently deleted album and if there is any, a lot more photos and videos that were supposedly "deleted", will show up. Delete those and that can help you gain back space. I have to do that a lot on iPhones that the owner complains of running out of space and not seeing how. They would show having about 200 mb of space left and after doing that, they will gain about 2 gigs. If you need any help, contact me.