What version of iOS does the Iphone 3GS run?

Thinking of buying an Iphone 3GS, and just want to know what version of iOS they run, also some features of this version.

We can run latest version of ios, which is running in i phone 5.it is official.

D this side. IPhone 3gs is the first s-series device by apple and its the first device which has seen 4 iOS generattion. Iphone 3gs is nice and it depends on you, "do you like it or not". If you like it just go for it i have iphone 3gs and 4 and their is not much difference, its that what i felt. Despite of looks and ram everything is kinda same.

and i would like to tell iphone 3gs will end up with iphone 4 and till now iOS 6 is in market and iphone 3gs can run it.

It's runs up to the most recent iOS 6

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