Downloading and installing Ziphone is a relatively straightforward process. Here's a step-by-step guide to get you started:
Open the ZiPhone executable. On Windows, you may need to run it in Compatibility Mode for Windows XP or 7. Select Action: Jailbreak: Grants access to the file system. Unlock: Allows the iPhone 2G to use any SIM card. Ziphone Download
ZiPhone exploited a (similar to the “Pwnage” exploit chain) to gain root access. It was distributed as: Ziphone Download