How to find out my Iphone 4s iOS version if it's not activated?

I bought a used Iphone 4s but it had no SIM Card so I can't activate it but I need to find out it's version to hacktivate it, Anyone know how? I already tried plugging it in to Itunes but it won't tell me anything.

I don't think you can sorry

Try tinyumbrella

To do that all you have to do is stick a SIM card in it even if the card isn't activated