Why do I have no space on my iphone 4?

I have an 8 gb iphone 4…

So basically what happened is that I kept reinstalling an emulator called gba4ios and i ended up having no space on my phone. After my phone automatically cleaned my apps, i only have 128 mb of space left. I turned off my phone and it still won't work. From the amount of apps I deleted, I should have at least 2.9 gb free of space. I tried fixing the problem but it still won't work?

Restore the phone.

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