I don't like the ios7 interface and was wondering if I jailbroke my iPhone 4, the ios7 would be required or not. I saw someone who had jailbroken iPhone 5 and it was blazing fast becaus he controlled some feature that came with the jailbreak. What's that function called? Would it make my iPhone4 fast too, because I like iPhone 4 better except for the fact that it is slow and heavy.