What is the iphone 3gs original operating system (IOS)?

I just bought a used iphone 3gs and the guy who was selling it to me reset the phone and i need to know what the IOS number is,

Added (1). It needs to be activated to

Go To Settings > General > About > Scroll To The Version Section.

Tap: Settings >> General >> About

This should give you the iOS version number.

IOS 3 was the original

Settings > General > About

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