GeoHot has released blackra1n RC3 in this week and it helps user jailbreak iPhone 3.1.2 firmware. Good thing about this tool is that it also includes blacksn0w, which is an unlocking tool for 05.11.07 baseband.
Those who have upgraded their iPhones to iPhone 3.1.2 through iTunes can use blacksn0w to unlock the device. Blackra1n RC3 supports iPhone 2G, iPhone 3G, iPhone 3GS as well as all iPod Touches.
Here’s how you can jailbreak iPhone 3.1.3 firmware using blackra1n RC3 -
Requirements:
- Latest iTunes software
- Blackra1n RC3
Steps to follow:
1. Open the blackra1n application on your desktop and click on “make it ra1n” option.
2. Now iPhone will move to recovery mode.
3. Blackra1n will install all necessary files on your iPhone. Just wait for iPhone to reboot.
4. Start the blackra1n application on your device and install Cydia package.
5. That’s it. Reboot your iPhone once again.
Your iPhone is successfully jailbroken. Have fun. 
Related posts:
- Guide to unlock iPhone 3.1.2 Firmware with blacksn0w
- Guide to jailbreak iPhone 3.1.3 with Sn0wbreeze
- Guide to Jailbreak iPhone OS 3.1.2 with Sn0wbreeze
- Blackra1n for iPhone 3.1.3 Firmware
- Guide to jailbreak iPhone 3.1.3 with Redsn0w 0.9.4
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Thanx a lot for this guide. I have successfully jailbreaked and unlocked my iphone 2G. however, I am facing a problem with my location services. My “Maps” application is unable to find my location and so are other softwares that require my location. Can you help me with this?
I guess your carrier is not supporting to these services. Just try using another sim card.