I'm a noob to the whole iPhone scene, and I have a couple quick questions. I have an iPod Touch right now, but I'm thinking about getting an iPhone (used, from a friend) so I can use the camera and GPS, and Skype for phone calls. However, I don't want to start paying $70+ a month for cell service just yet. Can the iPhone 3G be activated and jailbroken so I can use it with no cell service, and just on WiFi networks like the iPod Touch is? Thanks.