What is the current latest working jailbreak firmware for the iPhone 4S?

I've purchased an iPhone 4S from some random by-passer for £100 and when I woke up in the morning, I noticed it was blocked, I was told I could unblock it if I jailbreak the device and I will then be able to use and make calls. Can you help me with this please?

The lastest jailbreakable firmware for the 4s is ios 5.1.1. But keep in mind the jailbreak for ios 6 is coming very soon

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