Memory problem

My phone shows that I only have 1.09GB free of 9.71GB on my phone storage. This has caused me to get an error message when updating or installing new apps saying that I don't have enough memory available. I have put all apps possible to my SD card, all photos, videos and music are on my SD card and it shows 11.5GB of 14.8GB available. What could possibly be taking up all the phone memory and how can I free it up?

I bought this phone used off eBay after my old phone quit on me.

Thanks...

Memory problem

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