How To: Unlock iPhone 4 (01.59.00) On iOS 5.0.1 Using UltraSn0w 1.2.5

UltraSn0w 1.2.5 was recently released to unlock the iPhone 4 running the iOS 5.0.1 firmware on the 01.59.00. baseband. It is important to keep in mind that in this new version of UltraSn0w you cannot unlock the iPhone 4 on any new basebands besides the *01.59.00 baseband.

*In order to see if you have baseband 01.59.00 on your iPhone 4 you will need to go into the > General > About and look for the Modem Firmware field.

In this how to guide from you will learn how to unlock your iPhone 4 on the 01.59.00 baseband running the iOS 5.0.1 firmware. If you have an iPhone 3GS please click here to follow our guide specific to unlock the iPhone 3GS on a number of different basebands including the special 06.15.00 iPad baseband.

Note: In order to update to the official iOS 5.0.1 firmware and still preserve your baseband so it is unlockable, you will need to follow our in-depth how to guide by clicking here (simply select iOS 5.0.1 instead of iOS 5.0 as said in the how to guide). DO NOT under any circumstance update to the stock iOS 5.0.1 or you will update your baseband in the process. You will need to create a custom IPSW through RedSn0w or Sn0wBreeze (click here for more info).

Unlock iPhone 4 With UltraSn0w 1.2.5 On iOS 5.0.1

Step 1: You must already be running the iOS 5.0.1 firmware on your iPhone 4 (click here if you are not), and you must also be Jailbroken on the iOS 5.0.1 firmware. If your iPhone 4 is not Jailbroken please click here.

Step 2: After your iPhone 4 is running the iOS 5.0.1 firmware and is Jailbroken you will need to simply launch Cydia from your SpringBoard.

Step 3: Once Cydia is up and running you will need to go into the Sources page. To go into the Sources page tap Manage followed by Sources.

Step 4: Typically, the UltraSn0w repo is included with Cydia. If not, tap the Edit button followed by the Add button and you will be prompted to add a URL source. Type:

Followed by tapping the Add Source button.

Step 5: Cydia will automatically refresh and update sources.

Step 6: After Cydia is done refreshing sources. Tap the Search tab on the bottom tab bar and search for UltraSn0w. Once UltraSn0w appears, tap on it and you should see version 1.2.5. Read through the description and tap the install button to install UltraSn0w 1.2.5 to your iPhone 4 running the iOS 5.0.1 firmware.

Note: In case you are not familiar with UltraSn0w, it is a software unlock for your iPhone 4 meaning you can use your iPhone 4 with any carrier by simply inserting the SIM card.

Step 7: When UltraSn0w is installed you must restart your iPhone 4 and run RedSn0w to boot tethered, you’re done!

With UltraSn0w now installed on your iPhone 4 you will be able to enjoy the benefits of using any carrier while running the new iOS 5.0.1 firmware. Let us know if you have any questions in the comment section below…

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  • Wang

    Incredible that they can’t be able to unlock iphone4 on new BB. Is it a mystery or something we didn’t know behind the scene??? Only gevey to unlock… I can’t believe they can’t unlock on new BB.

  • Agent_durbab

    i hope they can unlock the new bb

  • Pingback: How To: Unlock iPhone 3GS (04.26.08 – 06.15.00) On iOS 5.0.1 Using UltraSn0w 1.2.5 —

  • Cjmkori90

    For some reason the ultrasn0w update is not unlocking my iPhone 3GS 6.15.00 on iOS 1.2.5. It was just jailbroken and everything else is working fine. Any ideas what is causing this? The Serial number shows week 45 of 2010 if that is of any importance.. please help!! 

  • jsh

    When is the Unlock release coming out for BB 4.11.08 

  • hmood

    hey i did all steps and i missed (IMEI , ICCID and MoDEM FIRMWARE)


    Iphone 4 iOS 5.0.1 baseband 01.59.00


  • Modeenee

    I have a modem firmware 04.11.08… what shall I do? shall I update the baseband or leave it and unlock without updating the baseband?

  • mp

    it didn’t unlock mine.. which is on.. 4.11.08 modem firmware.  anyone has any better idea.. please help..

  • Flydennis

    If you jailbroke using new rednow do you still need to boot tethered?

  • Flydennis

    Hey mp if you have an iphone 4 it only works on BB 1.59

  • guest

    do i still ‘boot tethered now’ if its untethered?

  • Bsoltani

    It cannot unlock my iPhone from orange to three :((( plz help

  • Cundari1117

    can u get rid of the jailbreak and still have the fone unlocked for any carrier

  • Immy196

    Can you unlock iphone 4 on baseband 4.11.08 by factory unlocking the phone?

  • Ali_a2222

    plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz unlock my iphone its lock about 1year plzzzzzzzzzzzzzzzz

  • Flydennis

    Sometimes i think people just read these post and dont respond cause that was exactly my question

  • Liz

    Any idea when it will become possible to unlock the iphone4S please?

  • Flydennis

    stuck on no servicw baseband 1.59 somebody help this is exactly what i was afraid of darn it

  • CoastRider

    Warning… does not work yet on iPhone 4 5.0.1 1.59.00 after pwnage jailbreak.  At this point ultrasn0w 1.2.5 install gives No Service.  Uninstalled ultrasn0w to make phone function again on Rogers but stuck with 1 bar signal indication – a very common result of preserving 1.59.00 on 5.0.1.

    Be aware of this if you are planning to update. Best advised to wait.

    If anyone has a fix to get ultrasn0w to work please post here.

  • Sweet-andy

    can we unlock iPhone  4s ?

  • Arkarnok

    Can I unlock iPhone 4 5.0.1 BB 3.10.01?

  • Jb

    i need an unlock for modern firmware 04.11.08

  • Andhufazil

    i am getting no service after searching for a while.. any idea
    i have iphone 4 on 5.01 BB 1.59

  • Pun Neha

    Did you find anything for 04.11.08 ???? I’m looking for same. :(

  • Syed Ali

    Is there unlock for iphone 4 on IOS 5.0.1 ans BB 4.10.1

  • Rolando

    como desbloqueo el iphone 4 con el baseban 4.11.08 alguien me puede ayudar

  • Faris

    is your son name mutafa

  • T Wolttan

    Hey Please help me to unlock Modem firmware 04.11.08……

  • Rafi Saddat

    plzz help how can i unlock iphone 4 bb 4.11.08

  • Motoman196

    what if the modern firmware is 04.11.08

  • Motoman196

    what if the modern firmware is 04.11.08

  • Little_923

    didnt work on mine just says no service, is there a fix yet?

  • Adam Randall87

    unsure have u found anything?

  • Leeboosey

    it never worked! followed yoor every step and it just came up no service still ????????

  • john

    are you on the right baseband? and did you get it to work?

  • john

    I have Iphone 4 bb 01.59.00. unlocked on ios 4.0.1. 
    I really want to update to ios 5 BUT all the comments say it isn’t working.
    can somebody PLEASE tell me if this is working or not?

    Please respond!

  • john

    did you get it unlocked yet?

  • feedle

     Nope. There is currently nothing to do. I have been googling like mad, and there is NO fix for 4.11.08. Now I have an iPod touch

  • R-SIM IV !!!!!!!

    Hi !
    R-Sim 4 is coming out in about 10 days ! wich will unlock your 4.11.8 but it will cost you about 60$ :/ but it will be worth it so hang in there ! lol 

  • vin

    nothing is happening after installing the redsn0w 

  • Amel Jasic

    is there any possible way to unlock OS 5.1 BB 4.12.1??

  • afron

    i have a modem firmware 4.12.01 and it just says no service, anyone else with this problem?

  • Saliyuba

    Are you using iphone4? It should work! I did mine

  • Nicollette_hough

    I really need help unlocking my Verizon iPhone 4 . If anyone has any idea how to do it, please shoot me an email at . I’m looking to get rid of my verizon service and use something cheaper. Thank you :)

  • Ilovemudkip

    how can i find out if it worked or not with out putting a different sim card in? the iphone takes the small sim card, but all my friends phones have the big ones.

  • Layziena

    no need of Gevey Sim or R-SIM IV, iphone bb 4.11.08 can be unlock 

  • Mikey Star

    Does this still work? I have my phone jailbroken (untethered), so after this whole process is over, if I just insert my t-mobile sim card, it will work?!? Answer quickly!

    - Posted on : 4/28/12

  • Tjeveret

    5.0.1 unlock with Ultrasn0w on BB 1.59.00 now seems to work.

    Gevy sim unlock is rumored to be patched and not usable.

    SAM unlock was short lived. That’s as far as I know for now.

  • Sweenewdot

     by new one

  • Sweetnewdot

     find the key  U try

  • Sweenewdot

     Y   still try   by new one…

  • Lordedy10

    CAN I UNLOCK 5.1.1 bb 04.02.1

  • jmaf

     When is the Unlock release coming out for BB 04.12.01 ?

  • Abadi1966

    I have Iphone 4 with ios 5.0.1 , but i cannt unlock it.
    I try with ultrasnow , but is not possible.
    Can someone tell me why?

  • stone

    john did u get urs working?

  • Dennis van Bergen

    thx for saying that that baseband can be unlocked care to say how ? alway’s fun to see if someone say’s it can be unlocked but they don’t say how -_-

  • drew

    why my cydia dosen’t work now ?