How to Unlock iPhone 4, 3GS, 3G iOS 4.0.x for T-Mobile and other Carriers [ultrasn0w]

iPhone 4 was recently jailbroken and now it is unlocked too, thanks to the Dev Team. It cannot be easier, no PC/Mac required, only the internets!

All you need are the following :

  • A Jailbroken iPhone 4 / 3GS,3G (it should be activated, that is a pre-req for online jailbreak)
  • A WiFi connection
  • That is pretty much it!

Step by step (best practices) :

  • Launch Cydia and search for ultrasn0w [if not found, then add repo : in Cydia]
  • Install ultrasn0w and reboot your iPhone 4 when prompted. Turn 3G off  (Settings -> Network -> Enable 3G -> Off) if you are using T-Mobile.
  • Make sure you have SBSettings installed. If you don’t know what it is, just search for it in Cydia and install it.
  • Search for SBSettings ultrasn0w toggle and install it.
  • Launch SBSettings by swiping on date at the top on the homescreen and tap ‘more’ and ‘Set Toggles’. Make sure ultrasn0w is set to ‘on’.
  • Now launch SBSettings and enable/disable ultrasn0w by tapping ultrasn0w toggle in one of the rows of icons. You have to enable it if you are using a SIM form a carrier who doesn’t officially provide an iPhone. Rest of the cases, just disable it. This saves memory and battery (however minuscule it is!)

Following are the iPhone baseband(s) that can be unlocked using ultrasn0w 1.0-1

  • Apple iPhone 4 baseband 01.59
  • Apple iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04

Recommended firmware : iOS 4.0 or iOS 4.0.1 depending on the activation status of your iPhone.

Mad props to Sherif_Hashim, Oranov and Dev Team for their efforts.

27 Replies to “How to Unlock iPhone 4, 3GS, 3G iOS 4.0.x for T-Mobile and other Carriers [ultrasn0w]”

  1. Great job to the dev team…but i am still stuck with my friends 3GS i think it is on 301 or 311 don't remember…anyways… there a way to jailbreak stock firmware…whether it being 301 or 311 is there a way to jailbreak fresh stock firmware for iOS4 for 3GS?

  2. Can you activate it on iOS 4? Do you have access to an official iPhone SIM? If yes, then it is simple and easy. If not, you may still try trick and then install ultrasn0w!

  3. Hi Kiran,

    You helped me before and everything worked fine – thanks! – and now I'd just like to check this:

    I have a 3gs running on 4.0 (thanks to your customware). I don't have an official iphone sim, and my iphone is currently safely unlocked.

    Can I update to 4.0.1 with this unofficial sim? Is it even worth it?



  4. hi exuse me for cmy bad english…..
    i have an iphone 3g ver 4.1 (8b117) and prog du modem 05.14.02…..
    no network ……. no wifi….
    can i downgrade it ?

  5. Cuando buscas ropa por internet, ropa environnant les hombre on line you qui estas cansado delaware infrared a new york tienda para awfull los modelos p ropa b los precios. Te proponemos n’t sitio web internet donde encontraras todas las tiendas en united nations single lugar comprarcomodo

  6. Thanks for your personal marvelous posting! I truly enjoyed reading it, you happen to be a great author.
    I will ensure that I bookmark your blog
    and may come back at some point. I want to encourage that you continue your
    great job, have a nice evening!

  7. In a tight race, thе i – Phone 4 built on tthe success оf itѕ predecessors
    to set the pace for smartρhones. There might bee some matters tto the loading time, some purposes
    will not perform, and quitee a few others. Τhis will make the othesr
    рersοn feel really good and creaqte soke interest
    in yοu.

    Chheck out my weblog … RSS feed –,

  8. When you are in Facebook on your i – Phone and looking at the main nine
    options you can see at the bottom that you are viewing the left hand panel of two panels.
    Using this free application it is possible to assume full control of your Windows Media Center PC over your Wi-Fi network.
    This app is available at the i – Tunes App Store for $0.

  9. Pretty part of content. I just stumbled upon your website and in accession capital to say that I acquire
    in fact enjoyed account your weblog posts. Anyway I’ll be
    subscribing for your feeds and even I success
    you get entry to consistently quickly.

  10. All apps and programs running on your phone will us
    the VPN IP, including web based activity, Vo – IP,
    browsing, and downloading. I had a problem though as the batteries in the remote had croaked.
    If an emergency happens and you need to call 911,
    they can easily trace your call and find you—all thanks to the GPS feature.

Leave a Reply