How to Jailbreak & unlock iPhone 2G & iPhone 3G on 3.1.3

The video describes how to Jailbreak & Unlock your 1st generation iPhone 2G version 3.1.3 and Jail breaking iPhone 3G on version 3.1.3 using Redsnow. The person says that the first and foremost thing to do is to update or restore your iPhone to 3.1.3 version and also remove the SIM from the iPhone. Then you have to download two files from the video description, then launch Redsnow. Then you have to browse the 3.1.2 file that was downloaded already and click on open and then on the next button. Then you select the options 'install cydia' (to jailbreak) and then 'unlock' and then click on next. The person says that the 'unlock' option will not be available for iPhone 3G. Then you get an option to select bootloaders (only for iPhone 2G, not for iPhone 3G). He says that you should now switch off the iPhone and plug it to the computer and then click on the next button. Now he asks to press the power button on iPhone for 3 seconds and the home button for 10 seconds. Then release the power button while holding onto home button for 30 more seconds. Now your iPhone downloads the jailbreak data and the required files for jail breaking. Once it is done, you can unlock the phone using the option. Now your iPhone reboots and is jailbroken and unlocked and Cydia is installed and is ready to be used with a SIM.