The 3GS is still the second-best-selling smartphone in the US (after the iPhone 4 of course):
https://www.macrumors.com/2011/08/22/iphone-4-and-3gs-rank-as-best-selling-u-s-smartphones/
And it’s probably cheaper to make than the iPhone 4 is. I’d be surprised if the 3GS doesn’t go away (Apple happily replaces best-sellers all the time) but at the same time, I can’t say it makes “more sense” to give the iPhone 4 away for free, if it’s a more expensive device.
I'm not saying it isn't a good seller, I think time needs to move on and Apple have been moving away from Plastic and this is the final step. Retire it while its still remembered fondly.
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