Unlock iPhone 4.3.3 with Ultrasn0w 1.2.3

May 6, 2011 - 22 Comments

ultrasn0w 1.2.3 for iOS 4.3.3 Ultrasn0w has been updated to version 1.2.3 with support for preserved baseband running iOS 4.3.3. In other words, ultrasn0w 1.2.3 does not unlock new baseband, but it does work to keep your unlock if you have been tugging along iPhone 4 with 1.59.00 or iPhone 3G & 3GS with 4.26.08, 5.11.07, 5.12.01, 5.13.04, and 6.15.00.

If this applies to you, you’ll want to use PwnageTool 4.3.3 (Mac) or Sn0wbreeze (Windows) to jailbreak while preserving your old baseband and updating to iOS 4.3.3.

Install Ultrasn0w Unlock for 4.3.3

After you are jailbroken, ultrasn0w is installed through Cydia. You can generally do this just by searching for “ultrasn0w” but if that fails:

  • Add http://repo666.ultrasn0w.com as a source repository to Cydia
  • Search for “Ultrasn0w 1.2.3” and install
  • Reboot your iPhone

Assuming you have supported baseband and everything is done correctly, the iPhone will boot unlocked and ready for another SIM card. Remember that many unofficial carriers do not support 3G networks so you should disable that in network settings if things aren’t working as expected.


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Posted by: Matt Chan in iPhone


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  1. Pavan says:

    I did the same thing which was said above but its not working properly as it is showing “searching…..” all the time Pls somebody help me with any other source

  2. ade says:

    I got an iphone 4 not activated, when I turn it on it askes me to activate and I dont have the sim because it not lock to a particular career. Please how can I unlock it? hellllllpppppp!!!

  3. Jeremy says:

    Hi, I have a ipone 3gs old bootrom on 4.3.3. Ultrasnow 1.2.4 doesnt work is there anyway i can get 1.2.3 to work.

  4. Daniela says:

    Help! I got an unlocked iPhone4 version 4.3.3, everything works perfectly but when I try to access apple store to download applications, I can’t. How can I get it to work?

    Thank You!!!

  5. ashish says:

    same hear i phn 4.3.3 wan to unlock hw can i do it.

  6. afzal says:

    i has iphon 4having 4.3.3.ios of atnt does it unlock by this procedure

  7. spring says:

    hi all,

    How to unlock Iphone 4 baseband 04.10.01 with Ultrasn0w 1.2.3

    Thanh you very much

  8. shibs says:

    hi….am back again
    how can i play a song out to my friend while I’m on a call with him/her on my iphone 3gs?
    is there any jb app or nythng for it?
    plz help me….

  9. Pritpal says:

    I was on 4.2 earlier and had network issues so i updated my iphone 3gs to 4.3.3 with redsnow then installed ultrasn0w 1.2.3 using cydia..still having issues with network..any solution..?

  10. John says:

    I’ve installed it on 3gs 4.3.3, and no signal!! Jailbroke first so I have compatible stuff needed and still don’t work,now phone was blocked by apple? Is it suppose to unlock and unblock?

  11. abdulla says:

    Hi guys,
    I have got an iphon 4 with ios 4.3.3. I’ve tried to install ultrasnow 1.2.3 to unlock my iphone. But, i couldn’t install it. Please help me get out of this trouble…

  12. john says:

    I have a iphone 3g 4.2.1ios after i jailbroke my phone and update from 5.15.04 to 06.15.00 unlocking with ultrasn0w 1.2.3 i got the signal n gettin incoming calls & out going calls i can’t make call failed” I tried to select manual the network bout nothing…..plz help me out….

  13. Shadow says:

    I got an unlocked iPhone 4, and the baseband’s already at 4.10.01. Is there anyway I’d be able to jailbreak it(while still maintaining it’s carrier unlock)?

    • 6italia0 says:

      if its a factory unlocked iphone then jailbreaking it will not change that. your iphone is imei unlocked so it can never be locked. I’m using a factory unlocked USA iphone 4 4.3.3 4.10.01 BB and it works perfectly fine with the jailbreak. also if your using the at&t iphone 4 then you’ll just need to use a gevey sim which jailbreaking makes it easier to use a gevey card via cydia.furiousmod.com/ added in sources in cydia. hope this helps.

      also install pdf patcher 2 (security patch from @comex)

  14. shibs says:

    after unlocking with ultrasn0w 1.2.3 i got the signal n gettin incoming calls also…but i cant make out going calls…its showing “call failed”…..plz help me out….

    • 6italia0 says:

      install ultrasn0w again maybe? remove your sim card before you try this, once it is done rebooting or respringing then insert your sim card and try again and make sure 3g is off, data roaming is on and cellular data as well. hope this helps

  15. Caden says:

    I feel so much happier now I unesdrtand all this. Thanks!

  16. Paulo says:

    did all that is said. Worked fine at jailbreaking. but when sim was installed the iphone satys stuck on searching and never finds the carrier signal.

    • Ksmart29s says:

      Get the Gevey sim, no other choice…

      • 6italia0 says:

        add the cydia.furiousmod.com/ repo in sources and install the furiousmod unlock utility so that when you insert your gevey card with your sim card it will immediately regain signal without having to use 112 (112 is only for data network and mms) otherwise only calling and texting will work.

  17. jon says:

    damn right i did the same thing and now im wondering the same thing too…

  18. farah says:

    I just wanna know ..is there going to be a new release to unlock Iphone 4 or is it just not gonna unlock from now…caz I didnt know and I jailbroke my phone ios 4.3.3 and ultrasn0w downloaded version 1.2.3 and now i really dont know what to do…plz help

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