What can I do on iPhone 4s that I can't do on 3gs?

I have the 4s right now, but my toddler has ruined it… Shattered the screen and both camera's. I don't have insurance so i replaced the parts myself for cheaper.well, now my screen is fine but my cameras don't work.i'm an instagram addict so thats an issue lol. I don't use Siri much so thats no problem to loose. My mom has a 3gs that i can have… Will i loose any other functions switching from 4s to 3gs other than siri, storage space & a front camera? I NEED A WORKING CAMERA! But i also love apps such as instagram, path, vox, and many others… Will all of the apps work on the older model phone?

The basic apps will work but will be a bit slow, the 3GS does have a terrible camera, 3.2 megapixel and no flash so… If you are and bad budget then use it for the time being otherwise get yourself a new phone.

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