Where's a legit place to jailbreak my iphone 4?

I don't want the website t be a scam and i want it to be trusted and safe! I just got a brand new iphone 4 and i want to jailbreak it but there's a lot of scams out there and i want a legit website. Any reviews or good places?

Added (1). I HAVE SOFTWARE 6.1.3:c

There's a million different programs. Here's the first tutorial that came up (it's really simple, download a program and click a few buttons!):

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