Step 1: Download redsn0w 0.9.6 rc13 using our Jailbreak Programs Tool
Step 2: Download your device firmware using our iOS Versions Tool
Step 3: Open redsn0w and then browse to the file you downloaded on step 2
Step 4: Push the next button and choose your options (Don`t forget about Install Cydia)
Step 5: Put your phone in DFU mode and press next to implement the jailbreak solution
Step 6: To unlock using ultrasn0w open Cydia, search ultrasn0w and install it. After installing, reset your device and you should be ready to use it.
Your device is now jailbroken!