Got an iPhone 3G or 3GS on iOS 4 that’s SIM-locked to a carrier, and you want to break it free of carrier-restrictions to be able to use it with a SIM of your choice? Now with iOS 4 officially announced, you can easily jailbreak and unlock this firmware on your iPhone 3G and 3GS, regardless of what baseband it has. Let’s take a more detailed look at it, consider any limitations, and get on with the complete procedure.
The question of whether the whole idea of carriers locking phones to their SIMs is right or wrong, is a debatable one. While it does make sense that carriers wouldn’t want their subscribers to switch to another network while they are using a device that they purchased on contract, there are still times when it does make sense to temporarily change your network. One might be travelling overseas and want to save up on the high roaming charges by switching to a local carrier’s SIM, or one might be in an area where there are coverage problems with one’s carrier, and switching to another carrier makes more sense while there. Thankfully, the developer community usually ends up finding a method to override this restriction and allow you to use your phone on any network that the device can support.
Before we begin, there’s something important to consider. We are not so sure about unlocks working on 3GS and iPod touch 3G because a tweet from @musclenerd went like: “iPhone 3GS & iPod 3G owners who used Spirit for your first Jailbreak show stay away from iOS4 for now.” However, those of you who used any other jailbreak method should be good to go, even on the iPhone 3GS.
For this unlock, you need to have a jailbroken iPhone 3G/ 3GS.
Disclaimer: Please make sure that you have ample hands-on jailbreaking experience before trying your hands on this one. Addictivetips won’t be liable for any damages that may incur to your device during the process
Here’s is the step by step guide on how to unlock you iPhone 3G and 3GS using UltraSn0w 0.93.
- The first step is to go to Manage tab in Cydia and add the following source “http://repo666.ultraSn0w.com”.
- If you are a T –Mobile subscriber, make sure to turn off your 3G network before installing ultrasn0w 0.93.
- Search for Ultrasnow 0.93 and press Install at the top end of the screen.
- After installation, you will see that your iPhone 3G and 3GS has been unlocked.
Update: Ultrasnow 0.93 is compatible with all basebands since iOS 3.0, they include, 04.26.08, 05.11.07, 05.12.01, and 05.13.04, as mentioned here.