Why did my iPhone photos suddenly disappear?

I was using my phone and opened the photo app. Instead of my 1,000 photos being there, I only have 33. I restarted my phone and it didn't work. Any explanations please As soon as possible?!

Cause they can

Maybe you had your photos saved to iCloud and you turned off iCloud. Maybe you had them saved to Photo Stream, which deletes them after 30 days. Maybe your phone is defective.

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