What can the iphone 5 or 4s do that the iphone 3gs can't?

I mean like distinct features. And are there some apps or stuff like especially for the 4s or 5? Cause I'm thinking about getting an iphone and well they all look the same to me.except of course no front camera on the 3gs but I can live with that. So what should I get?

Far better hardware…

The 3GS does not have facetime (for the lack of the front camera) and it has a low resolution screen. The iPhone 4 and newer have a retina HD display screen. The 3GS is much slower than the newer models because of the processor. The 3GS will not have Siri. It is heavier and has lower battery life and has a curved back rather than a flat one. And that's all I can think of right now. If I were to get an iPhone for the first time, the lowest one I would get would be an iPhone 4 because they haven't changed much beyond that besides adding Siri and faster processors and a bigger screen. I definitely would not get the 3GS because it lacks many features such as facetime.

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