How to Unlock the iPhone 4, 3GS, 3G Using UltraSn0w

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Posted November 28, 2010 at 11:55pm by iClarified

These are instructions on how to unlock the iPhone 4, iPhone 3GS, and iPhone 3G for use with any GSM cellphone carrier using UltraSn0w. This will work with the iOS 4.2.1 firmware if you are on the 06.15.00 baseband.

Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00, or 01.59 baseband(modem firmware).

To find your firmware and modem firmware(baseband) versions you can follow this tutorial.

If you are on T-Mobile remember to turn off 3G before starting...

Step One
Press to launch Cydia Installer from your SpringBoard.

How to Unlock the iPhone 4, 3GS, 3G Using UltraSn0w

Step Two
Press to select the Manage tab at the bottom of the screen.

Step Three
Press to select the large Sources button

Step Four
If the ultrasn0w repo is not present press the Edit button at the top right of the screen. Otherwise, skip to Step Nine.

Step Five
Press the Add button at the top left of the screen.

Step Six
Enter http://repo666.ultrasn0w.com/ as the source url and press the Add Source button.

Step Seven
Once the source has been added press the large Return to Cydia button.

Step Eight
Press the Done button at the top right of the screen.

Step Nine
Press to select repo666.ultrasn0w.com from the list of user entered sources.

Step Ten
Press to select ultrasn0w from the list of packages

Step Eleven
Press the Install button at the top right of the screen.

Step Twelve
Press the Confirm button at the top right of the screen.

Step Thirteen
After installation completes successfully press the large Restart Springboard button.

Step Fourteen
You should now be able to insert the SIM of your choice!

***THANKS: A big thank you to all the members of the iPhone Dev-Team for all their hard work! It is much appreciated by all.

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georgi - May 17, 2017 at 1:37pm

and for me doesn't work

Reply · Like

soly dolyinh - August 28, 2016 at 2:54pm

sorry i am still locked it all worked fine except the part where i check it do i have to restart no service iphone 4 04.12.09

Dragec - March 28, 2016 at 3:56am

I finally made it on an iPhone 3G, 4.2.1, 5.15.04!!! Thanx for the tutorials, although they contain only bits of information, and if you get stuck anywhere you'll have to google further. To succeed, I used redsn0w v. 0.9.14b2, not the latest one (the latest one will give you faulty baseband after downgrade with no wi-fi, bluetooth or IMEI, and you will have to start all over again). After upgrading the baseband to 6.15.00, I got stuck on apple logo (bricked phone). To bypass this, you need to download, and Select IPSW iOS 4.1 (not 4.2.1), and use "Just boot" option. After the phone boots, it will be buggy (the screen), but it will become alive again. Check if the baseband is 6.15.00. If yes, proceed to Jailbreak in redsn0w (this time using 4.2.1 IPSW), and tick the boxes Install Cydia, and Downgrade baseband. After it is done, you will have an iPhone with baseband 5.13.04, which you can unlock with ultrasn0w, but (most probably) with "No service" bug. To resolve this, follow the tutorial concerning this matter, and voila! iPhone unlocked. This procedure felt like walking through thick bushes...

H1uam - October 27, 2014 at 5:18pm

Great instructions, best I had found as others I tried took me hours and did not work. Many thanks

jaykay - October 20, 2014 at 1:55am

how to unlock you iPhone just go on your iCloud account on a computer go to finder click devices click the device logged in to your iCloud click listed then put new pass code then got to your iPhone put in new pass code. your phone will ask for iCloud or apple id then put the pass code in that then the iPhone will be unlocked

ribas - July 9, 2014 at 9:05pm

nao funcionou, fiz como foi ensinado. did not work, as I was taught.

bob - June 9, 2014 at 2:42pm

Nope, still "searching". :(

iuhoosiers - June 11, 2014 at 12:51am

I get the same message... "Searching..."

Huy - June 6, 2014 at 12:54pm

Cam on ban rat nhieu

rosh72 - April 27, 2014 at 2:42pm

how to unlock iphone 4 32 gb ios 5.1.1 baseband 4.12.01 japansoft carrier

dundas - April 18, 2014 at 11:59pm

I can't seem to figure out how to unlock my phone. I have 3gs with 6.1.6 modern firmware 5.16.08 I have jailbreak with redsn0w Installed Ultrasn0w I am stuck on "No service" Ive tried so many things I cant figure it out.

Riz - May 28, 2014 at 5:06pm

I am also having the same problem, were you able to fix it ? if yes, how ?

guhgyg gygfjgfbh - January 25, 2015 at 9:40pm

hola.

huy0979 - March 6, 2014 at 1:13pm

Does this work on a Iphone4s?

Leandro Salazar - March 8, 2014 at 10:30pm

no, this metod doesn't work for iphone 4s.....

Logan - March 5, 2014 at 5:05pm

iPhone 3GS Version: 6.1.6 Modem firmware: 06.15 Install cydia ultrasn0w install finish... No service... How? Please help?

nomad - March 7, 2014 at 9:13pm

uninstall ultrasn0w, use redsn0w to downgrade from ipad baseband, that should bring you to baseband 5.13.0 or something like that, then install ultrasn0w again, good luck

nomad - March 8, 2014 at 11:13pm

correction : that should bring you to baseband 5.13.04 , i just tried it today

yrubin07 - April 29, 2014 at 7:42am

@nomad I tried downgrading and it gets stuck on the white text on screen part doesn't even get to flashing baseband

yrubin07 - April 29, 2014 at 7:59am

iphony - October 21, 2014 at 5:52pm

That worked for me on 3GS 6.1.6. From the beginning if I remember correctly, 1. redsn0w: uncheck Cydia and everything else, check upgrade to ipad baseband 2. Repeat redsn0w, this time with: check Cydia, check downgrade baseband. Now you have tethered boot 3. In redsn0w: Just boot 3. From Cydia, install p0sixspwn. This makes it untethered boot. 4. From Cydia, add the ultrasn0w repository and then install ultrasn0w. Voila! Service! For me the key step was to start over, then upgrade baseband first and then downgrade baseband. Finally recognized T-mobile sim.

danleygg99 - March 3, 2014 at 3:14pm

Hey guys, want to unlock ATT devices? You can check out ATTiphoneunlocking, its the site i have been using for years to unlock my phone, it works pretty good

Thomas - March 1, 2014 at 10:44pm

Just did the jailbreak on my 3G using the iClarified instructions, and included the iPad baseband when I did it. Worked fine, now jailbroken, and shows 06.15.00... but, when I try to run the above, when I click to install Ultrasn0w, I get "the requested modifications cannot be applied due to...' :S

vxr - February 26, 2014 at 5:33am

my iphone 4 basband is 4.12 how to downgrade to 4.10 ? 1.59 ?

daoshi - January 27, 2014 at 6:10am

I have an iPhone 4s with iOS 7.0.4, I cannot down grade to 6.x or 5.x. After I tried the steps suggested, it comes with a message "SIM Not Valid". Anyone suggestion, ot it just doesn't work for 7.0.4? Thanks. Joseph

Duardinho - January 25, 2014 at 5:40pm

Hi all! I've just jailbreaked my iphone and now tried to unlock it because I changed carrier... now, it keeps searching for the carrier and I cannot make any calls... any suggestion? I'm a bit "fresh" on this kind of matters. Thanks all

jag broncano - January 21, 2014 at 5:57am

Thanks you so much..

Jimmy - January 14, 2014 at 5:48pm

Worked at last. Thanks guys. Downgrading my baseband from 6.15 to 5.13.04 did the trick. I have 3Gs and updated it to 6.1.3. with iTunes, JB with redsnow, install Cydia, Ultrasnow, then p0sixspwn for untethered JB. Found everything OK, except it was still SIM locked. Did the baseband downgrade with Redsnow and right away I could call out. Thanks again.

Gaurav - January 11, 2014 at 8:44am

Thanks Iclarified. I got my phone unlocked. Now can i update my phone to ios 6.1.3 (currently on 4.1.1) without getting my phone locked again ?

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