The following step by step instructions, along with video are for iPhone 4, iPhone 3GS (New bootrom / old bootrom) and iPhone 3G users. One thing which is important to note here is that this jailbreaktool doesn’t hacktivate your device. You will need an original supported SIM card to activate your phone with iTunes. If you don’t have an original SIM, you can follow the instructions in this video guide posted here to activate your phone without having the original SIM card.
Step 1: Start iTunes and backup everything from Contacts, Calendars, Photos, Videos and Apps.
Step 2: Update your iPhone 4, 3GS or iPhone 3G on the latest iOS 4.0.1 firmware with iTunes. Download links for the firmware and iTunes 9.2.1 can be found below.
Step 3: Once you are done with the update, make sure you are connected to a WiFi network. I haven’t tested it on 3G so I recommend using it on a reliable WiFi network.
Step 4: Open Safari on your iPhone 4, 3GS or 3G and navigate to http://jailbreakme.com.
Step 5: “Slide to Jailbreak” to begin the jailbreak process.
Step 6: Wait till the jailbreak tool download the required files..
Step 7: Once the download is completed, it will automatically start the jailbreak process. Just don’t do anything silly at this point. Wait till the jailbreak process is completed.
Step 8: Once done, you will be greeted with the following message.
Step 9: Close the browser and look for Cydia. You should now have it on your phone!
Here is the video, showing all the above instructions in detail:
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