My iPhone storage tells me it's full yet I haven't even used any?

So it's not a new phone it's my old one it's currently disconnected it's an iphone4s with like 12 GB or whatever the lowest is, and I use to have a lot of apps on it till I couldn't same with photos and after I got my new one i disconnected this and deleted everything on it. I let my mom use it with the Wi-Fi and it use to work fast and perfect she has only downloaded 2 apps and they really don't take any storage space at all but yet this notify comes on a lot and keeps telling me my storage is full

You can check the 'usage' and see what takes space. If you have update to some recent iOS, that will take much space. And photos take much space too. If there are many photos on your iPhone, you can use iMyfone Space Saver for iOS to compress your photo to release more storage.

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