Re: how to erease the space use by other in my phone memory
You could try using the app Battery Doctor to get rid of some of it. Maybe most of it. Depends on what it is. Try it, and if it doesn't work, you'll likely need to restore your phone as new. Have you checked apps for cache growth? Facebook is bad about growing. Anyway try this.
Battery Doctor - Must-have Battery Management App by KS Mobile, Inc. https://appsto.re/us/gRZTK.i