I can't jailbreak my iPhone? - 1

So for Christmas I got a Sprint Contract - iPhone 4 that is 6.0.1 but I'm having troubles jailbreaking it. Here's the steps ;
- I downloaded the Ios 6.0 and redsnow15b3
- I shut off my phone went to extras and ran the ISPW Ios 6.0
- I started the jailbreak procedure and made sure Cydia was checked.
- After everything was over I went back to the ISPW and made sure Ios 6.0 was on
- I pressed on ''Just Boot''
- After waiting on the pineapple on my screen, i check my phone for Cydia but its not there.
- So after all this I restore my iPhone and repeat everything
- And still i get the same result.

If you could help that would be awesome.