Unlocking Your iPhone

This is a follow-up to my previous article on iDevice jailbreaking. By default, every country has only

Note: Unlocking is completely legal, as long as it’s for personal usage, and not commercial purposes. Do not trust sites which claim to unlock your iPhone for cash.

There’s only one way of unlocking your iPhone, and that’s using Ultrasn0w (with a zero, not an o). But there are several ways to install Ultrasn0w on your iPhone

The easiest way to do it is using Cydia, on an iPhone that’s already jailbroken.

Note: Do not update to the latest firmware before installing Ultrasn0w (unless you already know what you’re doing), doing which you may possibly lose your chance to unlock your iPhone.

Follow these steps:

1. Open Cydia, and go to the ‘Manage’ tab.

2. Tap ‘Sources’ and tap on ‘Edit’ and then on ‘Add’

3. Type in http://repo666.ultrasn0w.com (again, the 0 in Ultrasn0w is a zero. If you type in the letter o, it will not work), and tap ‘Add Source’

4. Go to the newly added source and tap on ‘Ultrasn0w’ and install it

5. Done! Just reboot your iPhone and it will auto-detect your cellular service provider.

Note: Only certain basebands are supported by Ultrasn0w for the unlock (look for the supported basebands in the Ultrasn0w page of the Cydia source/ repository you just added). To know the baseband of your iPhone, go to ‘Settings’on your iPhone, ‘About’ and look for the number next to ‘Modem Firmware’)

If you have a baseband higher than 5.13.04, you can upgrade to baseband 06.15.00 and unlock your Iphone (only for 3G and 3GS models).

Follow these steps:

1. Refer to my earlier guide on how to jailbreak you iPhone here.

2. Download the iPad firmware containing the baseband here.

3. Check ‘Install iPad baseband’ (referring to the jailbreaking article), read the warning and agree to it and click on next.

4. Redsn0w will take care of the rest. After the iPhone reboots, with the new baseband, go to Cydia and follow the earlier procedure to install ultrasn0w.


  • There is no way to come back down from 06.15.00, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
  • If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence.
  • Starting with firmware 4.2.1 if you have 06.15.00 on your iPhone you will never be able to restore to stock firmware (it will fail). You can only install custom firmware.

Well then, enjoy your new unlocked iPhone!

Have any doubts/questions? Leave a comment.

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About the author

Prashanth Victor wrote 19 articles on this blog.

3 thoughts on “Unlocking Your iPhone

  1. interesting 🙂 cool

    1. thanks dude!

  2. This is an interesting article indeed. I used to have an iPhone 2 years back but I never took keen interest in knowing everything about it. Thanks for adding to my knowledge.

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