Why does my iPhone 4S keep losing space?

For example I had about 500 mb of space left on my phone and later that day when I checked it said I had 0 mb available and the space that my apps took up went up even though I hadn't used them. Any way I can fix this?

Did you update them? Updates take space too, in addition to the original space of the app.

So apps can grow quite a bit in size.

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