Almost there. Now all we need to know is what firmware you currently have on your iPhone. Click here to learn how to find out:

iOS 4.0 – iOS 4.0.1 – iOS 4.0.2 – iOS 4.1 – iOS 4.2.1 – iOS 4.2.6 – iOS 4.2.7 – iOS 4.2.8 – iOS 4.2.9 – iOS 4.2.10 – iOS 4.3 – iOS 4.3.1 – iOS 4.3.2 – iOS 4.3.3 – iOS 4.3.4 – iOS 4.3.5 – iOS 5.0 – iOS 5.0.1 – iOS 5.1 – iOS 5.1.1 – iOS 6.0 – iOS 6.0.1 – iOS 6.1 – iOS 6.1.2