Where have all my photos gone off my iPhone?

I checked my photos on my iPhone 3 yesterday and it says there are none there. When I click on camera, it says I can't take any photos as the folder is full! So where are all my photos hiding?

Not sure if this is part of the problem - I did drop he phone yesterday - just from my pocket to the floor but no sign of external damage and rest of phone works fine.

Help as have some great pics of my nieces on there that I don't want to lose!

Added (1). I'm about to change it - any recommendations for phones?

Why do you still have a iPhone

Well the pics can't disappear. Just connect it to iTunes and check if you can see your pics there.
If no, check in My Computer iPhone Pics folder.

And about a new phone… Go for android, maybe sony.

I've dropped my iphone several times on cement and never had a problem, but its always possible yours got damaged based on how it hit etc. If you backed your iphone up then all your pics will be there (either itunes or icloud). Otherwise shut it off and turn it back on, worth a try.