What's the difference between the 3 iphones?

I was going to get the original iphone for 99bucks cause the price got lowered. But i just want to know why the normal iphone is so cheap now? Why is the 3g and the 3gs so much better?

Original iphone is slower than the iphone 3g and the iphone 3gs is the fastest iphone out there.

The 3gs does video and has twice as much RAM.

  • Will there be a huge difference between the Iphone 4s and Iphone 5? I'm just wondering what you guys think… Because i don't think there will be a massive one. I currently have an iphone 4s and think well what else can they really do apart from make the screen wider and overall a thinner model. It's already quick enough and the camera is awesome. Also the same ios is going to be available for the iphone 4s and 5 so they'll just the same almost! I know they may have some new feature or two but really have they reached the max yet?
  • What's the difference between the IPad and a laptop and IPhone? I have a laptop and IPhone but interested in the IPad, tell me what it can do for me that the laptop and iphone can't. Why should i buy it.
  • What's the difference between androids and iphones? I have AT&T and i currently have a blackberry in January i'm getting a new phone i can't decide what droids to get or if i should get a iphone i'm not sure which one is better or what the real difference is.
  • What's the difference between iTouch 4G and iPhone 4S? Except the calling feature, Siri, and the A5 chip for the 4S, I think both are the same, and both have the same features.Am I right? But the design of the iTouch is way better IMO. Please reply, I'm planning to buy the Samsung Galaxy S3, but I'm confused, so I thought if I get an iTouch, I'd also get a replica device of iPhone 4S.