Unlock iPhone 4, 3GS iOS 4.3.3 with UltraSn0w 1.2.3 - iPhoneHeat

Unlock iPhone 4, 3GS iOS 4.3.3 with UltraSn0w 1.2.3

Ultrasn0w 1.2.3 can unlock iPhone 4, 3GS iOS 4.3.3 firmware. This UltraSn0w unlock for iOS 4.3.3 comes with older baseband supports, no new iPhone baseband. It just fixes the iOS 4.3.3 compatibility issues.


  • Compatible Basebands: 01.59.00 | 04.26.08 | 05.11.07 | 05.12.01 | 05.13.04 | 06.15.00
  • Not-Compatible Basebands: 02.10.04 | 03.10.01 | 04.10.01 | 05.14.02 | 05.15.04 (Dev-Team is working on Downgrade Baseband method)
  • iPhone 3GS (not-compatible baseband) users can upgrade to 06.15.00 baseband which is unlockable (Here is How to). Upgrading your iPhone 3GS baseband to the 06.15.00 iPad baseband hack to unlock MAY cause you to lose your GPS!

Let’s Unlock iOS 4.3.3 with UltraSn0w Unlock on iPhone 4 and iPhone 3GS.

Unlock iPhone 4, 3GS 4.3.3 with UltraSn0w

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

Your iPhone 4 or iPhone 3GS must already jailbroken on iOS 4.3.3. Jailbreak iOS 4.3.3 guides are linked at the bottom.

Assuming that your iPhone 4 or 3GS is jailbroken on iOS 4.3.3;

  1. Open the Cydia;
  2. Let the Cydia Load and Update if it prompts you;
  3. Go to Search tab and search for ultrasn0w and install it.
  4. Installing UltraSn0w will unlock iPhone 4 or iPhone 3GS iOS 4.3.3 with baseband 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00. Once the installation is completed, reboot your iPhone.

Voila! You have unlocked iPhone 4.3.3 on iPhone 4 / 3GS with UltraSn0w and can use SIM from any carrier now.

How to Jailbreak iOS 4.3.3

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64 comments… add one
Andro May 7, 2011, 8:46 am

which TinyUmbrella should I use to save my baseband ???

Dan May 7, 2011, 10:02 pm

It appears a new version of TinyUmbrella (4.33.00) was released today http://bit.ly/kgnXUk

hamiexz May 7, 2011, 10:44 am

waiting for the new baseband unlock.
but everytime ultrasn0w is updated for older baseband.

Youness May 7, 2011, 12:25 pm

I have a question guys,I have iPhone 4 running on 4.2.1 baseband 1.59.00 ….is there a way to update it to this new version 4.3.3 without change the baseband 1.59.00…..so I could use this method to unlock it…….thanks in advance.

Youness May 7, 2011, 1:37 pm

Im sorry ,never mind I have 03.10.01 baseband…thx.

hamiexz May 8, 2011, 1:51 am

use tinyumbrella

Hayssam abdulrahman May 7, 2011, 6:02 pm

Gentlemen ,
ware 4.2.1 & 4.1

Looking for pemenantly network unlocking solution

Appreciated your prompt support

We have USA IPhone 4G , firm

drchandoo May 7, 2011, 7:01 pm

guys what 05.16.02 baseband

drchandoo May 7, 2011, 7:02 pm

can we hope getting unlock for baseband 05.16.02

dan May 8, 2011, 4:50 pm

Can anyone pls help me. My iphone 3gs os 4.1 bb 06.15. I try to update it to 4.3.3 few times but i always got 1015 error.

adele May 10, 2011, 7:03 pm

you can not do a regular update with bb 06.15 via itunes, you can only do customized firmware through i’m not sure snowbreeze or ih8snow or pwnage tool.

phonepedia May 10, 2011, 12:10 am

please release new base-band update for iPhone

Amed May 10, 2011, 8:38 pm

Any luck with 05.16.02 Base band?

sriks23 May 10, 2011, 9:20 pm

i have an Iphone 4 with OS 4.2 and baseband 04.10.01.,please
let know if there is an unlock for this baseband..


Fredy22 May 13, 2011, 6:07 am

Yes Gevey Sim on EBay $12.00 the best unlock

Lucky May 12, 2011, 3:02 pm

hey guys i have an iphone 3gs running on 4.1 with baseband 06.15.00… is it safe for me to update to 4.3.3 with unlock and jailbreak??

ashif030 May 13, 2011, 1:48 am

can anyone help me?? I have iPhone 4 running on 4.0.2 baseband 1.59.00 ….is there a way to update it to this new version 4.3.3 and unlock the phone. remember one thing, my phone is not factory unlock phone, its software unlocked. also i need to jailbreak the phone. is it possible? please help me. your king cooperation will be highly appreciated.

domi1994assassin May 17, 2011, 12:57 am

Does Dev-Team any positive progress for downgrading 6.15.00?

nikhil May 19, 2011, 12:36 pm

hi .. i have iphone 4 formware 4.3.3…can anyone tell me about how to unlock this device..

AlAl May 20, 2011, 1:06 am

On IPhone 4, when its upgrade from IOS 4.1 with modem firmware 02.10.04 to IOS 4.3.3 is the modem firmware will be change?

HardRock May 20, 2011, 3:52 pm

Hi Guys.. i have 3GS JB and Unlock running 3.1.3 bb 5.12.01.
I want to update my os to 4.3.3

Now what i understand is :
1) Use TinyUmbrella to preserive my BB.
2) update to 4.3.3
3) JB and Unlock.

Could you guys please help if i am correct ?

Thanks in Advance…

iPhoneHeat May 21, 2011, 9:58 am

TinyUmbrella baseband preservation method applies to iPHONE 4 only.

Go for Sn0wbreeze (http://www.iphoneheat.com/2011/05/how-to-jailbreak-ios-433-sn0wbreeze-27/)
PwnageTool (http://www.iphoneheat.com/2011/05/how-to-jailbreak-ios-4-3-3-on-iphone-4-3gs-ipad-ipod-touch-with-pwnagetool-4-3-3/)

a custom firmware should preserve your baseband and then Install UltraSn0w (http://www.iphoneheat.com/2011/05/unlock-iphone-4-3gs-ios-433-ultrasn0w-123/) to unlock.

Abhi1982 May 23, 2011, 11:53 pm

I upgraded my Iphone 3GS to 4.3.3 and then jailbroke with Red Sn0w. Later i Unlocked with ultrasn0w

After unlock my phone is not receiving any cellphone signal 🙁

Not sure wat the issue is… pls help!!! SOS

iPhoneHeat May 24, 2011, 11:50 pm

because its baseband has been updated… You should have gone for Custom firmware
Sorry you’re out of luck, atleast for now

PR3gs May 30, 2011, 6:31 pm

I’m at custom firmware what do i do now

Tony July 3, 2011, 10:56 am

Just uninstall.

[email protected] May 23, 2011, 7:13 pm


I used the above instructions and hte baseband move to 05.16.02 from 05.13.04. The ultrasnow doesn’t work to unloock. Any suggestions?

[email protected] May 23, 2011, 7:36 pm


I used the above instructions and hte baseband move to 05.16.02 from 05.13.04.

1. The ultrasnow doesn’t work to unlock. Any suggestions.

2. Is there a way i can restore my baseband back to 05.13.04

3. Why wasn’t there enough instructions to inform me that the baseband will change after this JB?

alukado May 30, 2011, 2:21 pm

Well, why not just grab a gevey pro plus to unlock the iphone without any operation? I’ve pre-order it for $20 bucks at this site http://www.slickgate.com/_p2128.html , and would like to let you guys know how it works.

lynda June 7, 2011, 8:32 am

this is so frustrating….. trying to jailbreak my 3gs 4.3.3 and the firmware is not downloading right i think. All the videos i see have the iphone firmware on their desktop as an icon. mine is a folder(i extract it) when i open redsnow and i browse and direct it to the firmware it is not finding any IPSW files????
any help would be great!!!

lynda June 7, 2011, 8:33 am

when i unzip the firmware folder it has a error in the last few extractions and asks if i want to continue with out encryption??

me June 16, 2011, 10:13 am

check that vdo, it explains how to change the downloaded iphone file extension from .zip to .ipsw

also mozilla firefox eliminates this problem

once you change the file extension to .ipsw redsnow will be able to detect the firmware.

Good Luck

millenniman June 23, 2011, 3:18 pm

Hi, i have an iphone 3gs with baseband 05.16.02 does anyone know if that is unlockable at the moment? many thanks

bryno August 25, 2011, 7:48 am

i do have the same baseband. What did you do? can it be unlocked?

Mo0zeazzy June 25, 2011, 8:11 pm

missed one thing
method without Wifi !!!
install ios
jailbreak it with redsnow
install ipad base band
download ultrasnow (http://www.mediafire.com/?4qlc7ojtceus67o)
for 3gs n 3g dunno about 4g !!!
install it with 911 iphone pc suite if cyder2 doesn’t works

Srry FOR Bad English !!!!

Apple Umbrella July 6, 2011, 8:20 pm

really helping tricks you sharing. thanks for sharing

TAYAB July 14, 2011, 3:39 am


Marima September 3, 2011, 8:16 pm

Have you managed to use your phone if not i can help

vijay February 27, 2012, 11:25 pm

I too have the same problem . It’s on 4.3.3 Version & 4.10.01 Firmware. Anyhelp is truly appreciated. I have tried gevey sim & was successful, but it has its own set of problems (especially when you loose network & connect back in).

Michael July 15, 2011, 7:12 pm

I “Jailbroke& Unlocked” w redsn0w 4.3.3, it said that it would be JB and unlocked.. it did jail break, did not unlock, so i read some pages , ultrasnow 1.2.3… did that still no unloick, I think I may have overlooked turning off 3G. i will try this here shortly, anyone else have similar stories? how did u get past the issues? any and all help welcome!! Kregs

AHSAN July 18, 2011, 4:42 pm

i have iphone 4 with ios 4.3.3 with baseband 04.10.01 can any one help me that how to unlock it.

tayab July 28, 2011, 6:45 pm

me too having dis problem . i m still using gevey sim

Marima September 3, 2011, 8:21 pm

I tried the Gevey Supreme (yellow pack) but i get the message “no sim installed” any advice on what i should do?

AHSAN July 19, 2011, 7:45 pm

plz any one let me know when dev team going to release baseband 04.10.01 downgrade so that i can unlock my iphone 4

marco August 24, 2011, 1:29 am

i need help, i have a iphone 4 on 4.3 firmware,its jailbroken and i have 01.59.00 bootloader i installed ultrasn0w, turned off 3g ,reseted network setting and i still dont have signal even if i install a att sim there is no signal

thesaipankid September 3, 2011, 12:34 am

Is there a way to update iPhone 3GS to 4.3.3 on baseband 6.15.00

as September 5, 2011, 3:29 pm

hi, I have question, what’s the GSM AND CDMA, iPhones AND WHATS THE DEFRENTS BETWEEN verzen iphone and AT&T and which is better.
I would like to get me iPhone 4 to unlock it but i have no idea which better for me to get great locked phone> 😀

amanx19 September 7, 2011, 4:59 pm

thankssssssssssssss sooooooo muchhhhhhhhhhhhhhhhhhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!!!!!!!!!

meow October 17, 2011, 12:22 am

Hy all.. May i know how to unlock iphone 4 ios 4.3.3 without to use gavey again? Help me 🙁

sriks23 February 28, 2012, 8:46 am

Hi..They wont release any fixes ..gevey SIM is the only option,as the developers were paid not release any unlocks
,in future it wont come

vishal October 20, 2011, 6:34 pm

hello guys i m using iphone 3gs… i had erased it n now it is not working…. theres nothing on screen just a apple logo on it…. i restored it but of no use…please help….need to start it very urgently…thanks for ur help in advance…..

bob November 12, 2011, 4:09 pm

Hello, everyone
I have a 3gs, version 4.0.1, baseband 05.13.4
It was bought in the US (locked to ATT)
It has been jailbroken and unlocked to operate in France.

Can someone please point me to idiot-proof instructions for moving to 4.3, jailbroken and then unlocked?

I have tried googling, but what I have found seems to be incomplete. The first time I remember having to perform certain operations with the (original ATT) SIM installed, and certain with the SIM removed. I can no longer find instructions that include these details.

Many thanks for any help you may be able to offer.

gktssm December 10, 2011, 9:39 pm

Hi, I have iphone 3gs, baseband 6.15.00, firmware 4.1. I have tried different FW like 4.3.4, 4.3.5. i use redsn0w_win_0.9.8b4 and redsn0w_win_0.9.9b8 to jailbreak it. i even transfered those two ultrasnow.deb files to iphone directory, but still i do not have service i restarted iphone maybe 20 times, resit all setting, I have searched tons of site for how to unlock it, but still no luck.
can anyone help me please.

Mhmm190 January 28, 2012, 9:39 pm

Quick question, I sort of installed ultrasn0w and the version says 1.2.5, but the real problem is that my baseband is 04.10.01. I’m not unlocked right? Can I just uninstall it through cydia? Because I want to update from 4.3.3 to 5.0.1 without screwing anything up. Am I home free to update without messing my baseband up?

Ahsan January 29, 2012, 2:24 am

baseband 4.10.01 is not unlockable through ultrasnow uninstall it through cydia. you have to use gevey sim for unlocking purpose and before updating your ios you have to preseve your baseband using custom firmware.

jonhs March 21, 2012, 2:25 am

i have 3g model MB489B bootloader 06.04 (g2m3s2) and baseband ICE2-06.15.00 Os version 4.1 please i downgrade baseband i have problem for singal. 🙁

Alex May 18, 2012, 8:01 pm

hi… i purchased an Iphone 3gs Jailbroken iOs 4.1 and Baseband 6.15.00. i was hoping i can upgrade it to a higher iOs version and still have the unlocked feature on ultrasnow. Any suggestions on how to do it?

Ahmed August 7, 2012, 2:11 am

I have iphone 4 with firmware 4.3.1 and baseband 04.10.01.
Is there any solution to unlock it? Please help.

niko August 14, 2012, 8:00 pm

hi please temptations that my phone to Unlock iPhone 4 … 4.3.3

waqar October 27, 2014, 9:46 am

hai gays
me ne iphone 3g me software krwaya tha us k bad sim uthana chor gya he

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