IPHONE 5 help! Can't record video problems?

Hi, i just bought the iphone 5 a month ago. I deleted all of my photos on my phone and i only have 3 apps that were downloaded on my phone. I have a 16gb iphone 5 and only 13.5gb has been used.i've used the video option plenty of times before (recording well over 10 minutes) and i've deleted every video i've ever recorded. Why is there not enough space when i still have more than enough space on my phone?

What about music?
Are you sure the apps are not a big data size?

Goto settings, general, usage
to find out what's using the most data

Try to find your answers on apple support community
https://discussions.apple.com/...ing_iphone

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