Unlock iPhone 3GS / 3G iOS 4.2.1 with UltraSn0w 1.2

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UltraSn0w 1.2 is out to unlock iPhone 3Gs/3G iOS 4.2.1. This guide is on how to unlock iPhone 3GS or 3G iOS 4.2.1 baseband 006.15.00 with UltraSn0w. iPhone 3GS / 3G unlock instructions can be found below.

IMPORTANT

Your iPhone 3GS or iPhone 3G must already be jailbroken.
For baseband 05.14 or 05.15 your need to update your baseband to 06.15.00. (How to jailbreak and update baseband 06.15.00).
This UltraSn0w update can unlock baseband 05.13.04 or older too.

NOTE: This is NOT for iPhone 4 users. iPhone 4 unlock will take some more time.

Disclaimer: This guide is for information and educational purposes only. Use it at your own risk. we cannot be held responsible if anything goes wrong. *** Some users are reporting WiFi, GPS and battery drainage issues after jailbreak and unlock.

For Battery Drain issue READ THIS
For GPS issue READ THIS

Let’s unlock iPhone 3G or iPhone 3GS running iOS 4.2.1 or 4.1 with UltraSn0w unlock.

How to Unlock iPhone 3GS/3G with UltraSn0w

***T-Mobile USA users please disable 3G network first. (Settings >General >Network and turn the “Enable 3G” switch to OFF.)

Assuming that your iPhone 3GS/3G is already jailbroken on iOS 4.2.1/4.1

Open the Cydia.
Go to manage Tab at bottom.
Hit the big Sources button.

Hit the Edit button on Top-Right
Then Hit the Add button on Top-Left
Then Enter the following URL: http://repo666.ultrasn0w.com and hit the Add Source button.

Once the Source is added to the Cydia, hit the big return to Cydia button at bottom of the screen and then Done button.
Go to Search tab and search for ultrasn0w and install it.

Installing UltraSn0w will unlock iPhone 3GS or iPhone 3G iOS 4.2.1 with baseband 06.15.00. Once the installation is completed, reboot your iPhone.

Voila! You have unlocked iOS 4.2.1 on iPhone 3GS/3G baseband 06.15.00 with UltraSn0w and can use SIM from any carrier now.

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Posted in: iPhone, iPhone Guides, Tutorials, Ultrasn0w, Unlock iPhone on November 29, 2010

Tags: baseband 06.15.00, guide, iOS 4.2.1, iPhone 3G, iPhone 3GS, Ultrasn0w, Unlock

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Comments:

ely 27 February 2011 at 10:47 am #

I updated my iOS firmware to 4.2 and my baseband is now 6.15.00. I was able to jailbreak my iphone and installed ultrasn0w successfully. However, my iphone can’t still recognized my other sim cards from other networks. Can someone help me with this issue? There’s always a pop up on my iphone that no sim card is installed.. Thanks in advance. More power.

Reply
ely 27 February 2011 at 11:14 am #

I ran my red snow jailbreak not by “run as administrator”. I just simply open it. What will be the results or problems I will encounter on my iphone when I ran the redsnow not by “run as administrator”? I am thinking this might be the reason why my phone can’t still recognized another sim even after jailbreaking with redsnow and unlocking with ultrasnow. Please help. Thanks in advance.

Reply
revetwelch 5 March 2011 at 12:44 am #

I have an iPhone 3G – 4.1 – baseband: 05.14.02
I JB it with redsn0w 0.9.6rc8 (not sure for the last digit).
In this article it is said:
“Assuming that your iPhone 3GS/3G is already jailbroken on iOS 4.2.1/4.1″
Can someone confirm I can use UltraSn0w 1.2 to unlock my phone ?
Thanks

Reply
- iPhoneHeat 5 March 2011 at 5:44 pm #
  
  read the important part.. and I don’t recommend updating baseband to 06.15.xx
  
  Reply
  - revetwelch 7 March 2011 at 11:31 pm #
    
    Yes I read the limitations, and am ready to accept it.
    I just want to know if this UltraSn0w 1.2 will unlock my iPhone 3G – 4.1 – baseband: 05.14.02.
    Anyway, that is the only solution I found around to unlock it.
    
    Reply
    - iPhoneHeat 8 March 2011 at 6:30 pm #
      
      baseband to 06.15.xx >> Yes
      baseband to 05.14.xx >> No
      
      Reply
      - mo1z814 8 August 2011 at 2:10 am #
        
        use a custom firmware with sn0wbreeze and ireb then just install ultrasn0w after that. simple and works. if you get no service bars then you must enable then disable airplane mode and wait. if still no hope disable 3g and then turn airplane mode on/off and wait for the magic bars
  - marco 18 November 2011 at 11:47 am #
    
    i have an iphone 3G FW 4.2.1 Baseband 6.15, but unable to unlock via redsnow.. can you send me a procedure from jailbreaking and what versions of redsnow shall i use..
    thanks..
    
    Reply
    - iPhoneHeat 18 November 2011 at 4:47 pm #
      
      http://www.iphoneheat.com/2011/10/jailbreak-ios-5-with-redsn0w/
      Steps are same for 4.2.1 except it’s untetehred for 4.2.1… which means no need to tether boot..
      then unlock with UltraSn0w
      
      Reply
      - marco 19 November 2011 at 2:13 pm #
        
        but the thing is even i follow the steps how to jailbreak then unlock, still it is not successful. do you have any idea on what is the probable cause why after unlock via ultrasnow, still no signal from carrier.
      - iPhoneHeat 21 November 2011 at 11:31 pm #
        
        reflash the baseband with RedSn0w
bamrocks2 20 March 2011 at 1:21 am #

i jailbroke my iPhone 3gs runnig iOS 4.2.1 with ultrasnOw and i put in my tmobile sim card and it just says searching i turned of 3g what do i do?

Reply
ajaysidhu 6 October 2011 at 11:21 am #

hey, i got a iphone 3g firmware 4.1 with baseband 06.15.00 i already jailbreak my iphone with redsn0w on windows and now i am trying to install ultrasn0w to unlock it. The problem is that my iphone can connnect to my wifi, the bars are full but it cant connect on anything. even on safari, any help to solve this would be apreciated.

Reply