I am new to this, but I am going to jailbreak using Pwnagetool 3.1.4 (I have an iPhone 3G on AT&T with 3.1.2 currently on it) application, and this might be a dumb question, but on the screen to "choose your device", it has iPhone, iPod Touch, and iPhone 3GS. If I have an iPhone 3G, which one do I use? iPhone or iPhone 3GS? Also, after I jailbreak, how do I get that cydia application? Isn't it the gateway to all the other jailbroken apps?