iPhone 4, despite its signal woes is a beast when it comes to processing power and pure, raw speed (a lil’ better than 3GS). Jailbreaking iPhone 4 will give you access to themes, productive tools, unlock and more. I tested this approach with a 3GS, 3G and iPhone 4. It is a multi-iPhone jailbreak and requires no computer access! It is the same as described here but I wanted to document Cydia apps for iPhone 4.
Initially, I was unsure if Cydia is even needed for iPhone 4 with multitasking, wallpaper …