How to Jailbreak a sprint iPhone 4?

I have a iPhone 4 from sprint that I want to jailbrake I want to know what's the best program to
use? It has the 5.1.1 software on it.
Thanks

Added (1). Where do you download it at? I have looked all over the net and all i get is other dumb programs

Use Absinthe. I used that and it worked fine.

Back up all your stuff on itunes and then download absinthe for 5.1.1:
https://sites.google.com/site/greenpois0nabsinthe/absinthe-win-2.0.4.zip?attredirects=0&d=1

Then run absinthe program that is not in a folder (after extracting) i think its called absinthe-win-2.0.4
and let it upload all the driver files. Once that is done run the absinthe.exe program in the absinthe folder and it should recognize your device (it'll say iphone 4 with some additional information). Then follow the instructions, hit jailbreak, and just wait until it says that it has done jailbreaking!

You can learn how to convert an iphone to sprint in this article
http://howto.web4us.info/how-to-convert-an-iphone-to-sprint/