Why is my iphone saying the memory is full?

Okay so I have a Iphone 4s and I went to Germany last month and before I went I emptied my phone, like I moved all photo's/videos onto my computer so I would be able to take lots of photos whilst away, and that all went fine but since I've been home whenever I try to take a photo or film or whatever a message pops up saying the disk is full? But that can't be, because before I went away I had nearly 2,000 photo's on my phone and it never said my memory was full and I only have 715 photos so that doesn't make sense, I don't have alot of apps either?

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