we only have the iPhone 4. My girl hasnt had any issues with her jailbreak on her phone, we always have jailbroken phones. and I just got a new iPhone 4 strictly to keep in the car. its not going to be used for calls or any of that, just has service for the deck. that being said, phones already jailbroken. are those the said apps i need to download from cydia above, its there any other that are recommended to make it any more user friendly at all?