How to distinguish what firmware my locked iPhone4 has?

I found a Verizon iPhone 4 Model No.:A1349 in a local public restroom a few weeks ago. It has a passcode lock on it, virtually making it impossible for me to find out what firmware it has so I can find the proper GreenPois0n jailbreak for it. I want to be able to unlock and access this phone. Any ideas/feedback please?

You can find out using redsn0wdownload it and open it. When you click jailbreak it will take you to a screen with instructions(although you do not have to jailbreak to know) it will tell you at the bottom of the screen the iOS you have.

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