Why does it say my storage is full? (Iphone 4s)?

Ok so I have the 6.0 GB which sucks I'm getting a new phone soon! But anyways I have 3 pictures in my gallery and 7 downloaded apps. The rest of the apps come with the phone, and Can't be deleted. But yet my phone can't take pictures nor download anymore apps? Because "no more storage" I use to have like 30 pics and like 20 apps downloaded until it told me storage full then I deleted almost everything but yet it still wants to tell me that.

Settings > General > Usage > Storage | Manage Storage, and see who is using all the storage.

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