Can a jailbroken 4S access 2G/Edge? This is high priority for knowing if its possible.
All iPhones can access EDGE when you disable 3G/HSPA+.
I don't think that will be expressly stated. Since it's just the way it works. You can infer from the link I posted in my previous post, that it does go to 2g, but I don't think it will be outright stated anywhere.