My iPhone 3GS doesn't have a video camera? HELP!?

I bought my iPhone 3G S secondhand and i don't have the old owners number anymore. I realised my iPhone doesn't have a video camera, like when you click the camera built-in app it usually has an option at the bottom to swap between camera and video camera, but mine only has the camera? I've looked all... show more I bought my iPhone 3G S secondhand and i don't have the old owners number anymore. I realised my iPhone doesn't have a video camera, like when you click the camera built-in app it usually has an option at the bottom to swap between camera and video camera, but mine only has the camera? I've looked all over my settings to see if i could enable it or something but there's nothing that helps.. There's no questions or help about it on the Internet so it hasn't happened to many others and i don't know where to get help. Does any one know if there's a way to fix this. Please please please, I need to use the video camera for school trip next week
Update: thanks, I've realised it's not a 3GS it's a 3G, I was tricked when I bought it haha:/ thanks, I've downloaded some of the video camera apps and they've helped a lot
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