Technically, it’s not possible to unlock an iPhone that has been updated to iOS 4.1 because there is no unlock available for the iOS 4.1 baseband. Now depending on your situation, there might be a way to unlock your iPhone.

If you are still on iOS 4.0.1 (or even earlier version. ie 3.1.3), then you can use PwnageTool to jailbreak your iPhone while preserving the baseband (see our guide here). This will make sure you update to the latest iOS version but don’t update the baseband, which is the key part in unlocking your iPhone…

Again, if you have already updated to iOS 4.1 and upgraded your baseband, you will not be able to unlock. There probably won’t be any unlock for iOS 4.1 and you’ll most likely have to wait for iOS 4.2.

This being said, here is what you have to do to unlock your iPhone 4.1 using UltraSn0w. This will work for the iPhone 4, iPhone 3GS, and iPhone 3G.

Step 1: Make sure you’re still on iOS 4 or iOS 4.0.1.

Step 2: Jailbreak your iPhone using PwnageTool.

Step 3: Go to Cydia and search for UltraSn0w. Download and install UltraSn0w.

Step 4: Reboot your iPhone. Done!

You should now have an iPhone unlocked with UltraSn0w.

  • Jason

    Ok so I figured out my BB…it’s 5.14.02

    I understand a bit more now, I installed Ultrasn0w, but I guess since it’s not making calls with my other SIM it isn’t actually “unlocked.”

    Is the only way for the unlock to work right to upgrade to 4.2 and redownload ultrasn0w?

  • rdcbr

    i have the same problem im on the same situation let me kno what the cure to fix.. iphone 3g bb, 5.14.02

    • Ahmad

      iPhone 3G is now permanently unlocked! Ether install 4.1 or the latest 4.2.1 and use the latest RredSn0w jailbreak. During jailbreak check the box that says upgrade or fetch (or something like that) to iPad baseband. After the jailbreak is complete update Cydia, and install ultrasn0w and your 3G will be unlocked for eternity……unless of course Jobs decides to release iOS4.3 for 3G too.

  • Jaymin

    I have iphone 4g and base band 2.10. jailbreaked how to unlock?

  • simon

    my phone is 3g 4.1
    i jailbreak with (redsn0w_win_0.9.6b1)
    and i use Ultrasn0w to unlock but it not Unlocking
    plz kindly tell me what can i do

  • Aamir

    Also can someone assist if I can SIM UNLOCK my;

    iPhone 4

    carrier = not available

    version = 4.1 (8B117)

    model = MC318LL

    modem firmware = 02.10.04

    • oi sou alex, gostaria de saber si vc conseguiu desbloquear seu iphone, pq o meu eu a mesma configuração , mim avisa si conseguiu . email [email protected]

  • naji

    any news when unlcok is available

    iphone 4

    version 4.1

    modem firmware 02.10.04

    • Aamir

      Hi Naji, where are you?

  • Sunny

    My friend updated his 3gs from 4.1 to 4.3 which also upgraded his baseband to 05.16.01, so i tried downgrading it back to 4.1 but the baseband stayed the same…..any advice, i need to unlock the darn thing….

  • Fesked

    Also can someone assist if I can SIM UNLOCK my;

    iPhone 4

    carrier = not available

    version = 4.1 (8B117)

    model = MC603FD

    modem firmware = 02.10.04

  • Fesked

    can someone assist if I can SIM UNLOCK my

    iPhone 3g

    carrier = not available

    version = 4.1 (8B117)

    model = MB496FD

    modem firmware = 05.14.02


  • cripo


    i have a 3gs 4.1 jailbreak with limerain firmware 05.14.02
    i downloaded ultrasnow 1.2.3 and all says is searching then no network
    it works on orange and lookin it on 02

  • mehul

    hey i have iphone4
    version 4.1

    carrier carrier lab 8.0

    modem firmware 02.10.04

    how 2 unlock my phone

  • DeltaJB

    lol when you think back a few months!

  • Hey i have iphone 4

    version 4.1(8B117)

    carrier carrier lab 8.0

    Model MC603DN

    modem firmware 02.10.04

    how to unlock my phone?

  • Hey, i have iphone4

    version 4.1

    carrier lab 8.0

    modem firmware 02.10.04

    how to unlock my Iphone?

  • Rana Salman

    Ultrasnow is the best tool

  • Michael camara

    Help would be greatly appreciated!!

    I purchased a jailbroken Iphone 3GS via “Craig’s List” a few months back. I had an old Prepaid Go Phone (AT&T Network) sim card and inserted that into the piece: I get much cheaper rates for calling and texting this way but sacrifice data usage (only able to access the web when a wi-fi network is available). I’ve used it like this for the past 4 months – beautiful.

    I’d like to unlock the phone now so that I can sign up for a cheaper T-mobile plan (unlimited talk and texting with 2gigs of data for around 60 bucks). I attempted the unlock procedure as instructed by a YouTube video and my phone completed the software download BUT now she doesn’t detect any service provider! I had the sales rep at the T-mobile store place one of their sim cards in it – nothing. I placed my original Go Phone sim it – nothing. HELP!

    Is there a problem with my IOS version of firmware? Some of the videos I’ve watched mentioned the necessity to first change my base band to 6.15.00. How exactly is this done?

    My specs:
    Iphone 3gs
    Model mc555LL
    IOS Version 4.1
    Firmware 5.16.02 (base band)

  • hi i have iPhone 4 with iso 4.1 i want to unlock for using in morocco so if any one can help me to fixed this problème….thanks

  • can you update the iphone if its unlocked already?

  • need help experts,

    I have a third hand jailbroken iphone 3G, previous iOs 4.2.1 but some features seem to not work (wifi detection, drains battery fast, sim won’t work either) so i decided to downgrade it to iOs version 4.1.

    the problem is either the unit’s switch (top right button) is broken or the software malfunctions that it won’t work anymore, so the only way to put it to DFU mode is by creating custom firmware Enter_DFU.ipsw using redsnow. so i did, and the phone was restored to 4.1 iOs.

    I searched for a way to activate an iPhone without sim and unfortunately it requires the phone to be in DFU mode. i decided to create the Enter_DFU.ipsw for iOs version 4.1 but then when i tried to open it up in iTunes it requires sim card activation, now I could no longer restore it using iTunes since no “restore” button (in iTunes) appears, only the Sim card activation message.

    the question is, is there another way to restore (or enter restore mode) without using the iTunes so i could activate the phone without sim.

    Note: power button (top right button) does not work so i can’t enter DFU mode manually.

    need help, thanks experts!

  • ehsan

    my iphone is 3gs ios 4.1 unlock by software
    but i want ios 5 or later but idont know when i update ios i can unlock agane or no
    please answer me
    thank you very much
    and so sory about my poor language
    ( my email : [email protected])

  • Lawrence Whiteshirt

    Just need to unlock my password. This phone was passed down to me. Just can’t get the password unlocked