Jailbreak iPhone 3G is very risky because if there is a failure may be your iPhone so Matot, more information about the Jailbreak iPhone can be read here. Short Tutorial How to Jailbreak your iPhone following this only as an introduction only, step-by-step how to jailbreak or unlock the iPhone here only for the source of knowledge.
Note: You do NOT need to Jailbreak the iPhone to be able to add and install applications or various other interesting programs for the iPhone. You can Install Programs or Applications Through the Apps Store, you need only an iTunes account to be able to begin to Download and Install Applications from the Apps Store.
How to Jailbreak iPhone below only for the iPhone and Baseband Version 2.xx 3G iPhone is 2:28 or lower (How to find iPhone Baseband Version: on [Home Screen] click [Settings] - [General] - [About] - and see [Modem Firmware]). Step Jailbreak below uses QuickPwn software.
Prior to Jailbreak iPhone, download the files needed to process this Jailbreak.
QuickPwn-225-2.zip (16 MB)
iPhone1,2_2.2_5G77_Restore.ipsw or
iPhone1,2_2.2.1_5H11_Restore.ipsw (non Unlock) (246 MB)
Extract and save all files in the folder Pwnage
Connect iPhone to your computer and launch iTunes. Make sure your iPhone has been detected by iTunes. then do the restore process. Press the Shift key and click Restore.
Navigate to the Pwnage folder as it has been made earlier and open the file iPhone1, 2_2.2_5G77_Restore.ipsw.
Wait until the restore process is complete. After the firmware update process goes wrong. In the iPhone is still connected to the computer run the program to start the process QuickPwn.exe Jailbreak your iPhone.
Once your iPhone is detected by QuickPwn click the blue button.
Browse or search for a firmware file that you'd use the restore process (iPhone1, 2_2.2_5G77_Restore.ipsw) contained in the Pwnage folder Once QuickPwn Finish check whether or not valid firmware files click the blue button.
There are several options that appear to be installed to your iPhone, your iPhone is more powerful for it helps you select Cydia, Add Installer, and Replace Boot Logos. Click the blue button once again.
Make sure your iPhone is connected to the computer, before starting the JailBreak process. If you have been convinced click the blue button.
Next live you follow the steps as instructed by the QuickPwn carefully, and certainly without fault if you do not want to experience failure in the Jailbreak process.