IPhone 4 AT&T Cherry/Lem0n Unlock?

So i have an iphone 4 with ios7 i.ve tried anything to unlock it with no luck, and i found this It's called Lem0n or Cherry unlock i'm not sure because there are two web sites with different names but the same program. It seems a bit fake but i can't find anybody complainig or praising it so i'm asking here if you know something about it if it's fake or not

What is that you are trying to do. A jailbreak?

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