I have an iPhone 3G and an iPhone 4. I have forgotten the wifi password in my house, and I don't have it written down. My iPhone 3G has the password on it and can connect, but it's iOS version can't be upgraded for most of my important apps to work. I need to somehow get the password from the 3G and put it on the 4. I know that a jailbroken iPhone can get a wifi passwords app from cydia, but I have no idea where to begin jailbreaking. I'm really stuck here. Does anyone know how I can get the password? If not, can you guide me through jailbreaking?