2 Answers

Your best way is to have it done legally. Pay for it from a reputable site or through your phone service provider. Attempting to jailbreak for free causes problems because it may not work correctly after and it voids the warranty and no phone service provider will accept a phone that has been jail broken for free. 

I have never done this so I can only give you a link to websites that offer to jailbreak your Iphone http://www.bing.com/search?setmkt=en-US&q=jailbrek+of+iphone5%3F

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