Why does my iphone say that there's not enough available storage?

I deleted about 400 pictures and 20 videos and I have 10 photos right now
but if i try to take any it says my storage is full? What can i do to fix this?

Odds are you have encountered a software error. In the usual case the memory becomes mostly or totally filled with 'Other' data. The only way to fix it is to restore as new without restoring from a backup. But from what you say another thing is that those videos are eating up all your storage.

It is probably a software related problem. Instead of having to restore your iPhone using iTunes and lose all your data, try using this method.

1. Hold down the Power button and the Home Button together until iPhone screen just goes off.

2. Don't let go until the Apple logo appears again.

3. After the Apple logo appears you can let go and let the phone start, after that your problem should be gone.

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