Thursday, June 21, 2012

How to unlock iPhone 3GS on iOS 5.1.1

The following is a guide to unlock iPhone 3GS on iOS 5.1.1 via software. Before you proceed, please make sure that your iPhone 3GS is not one of the ones that comes with Toshiba baseband chip. This is the easiest/fastest method i've found and i've tested it working personally. The risk of bricking your phone is minimal.

  1. Check the serial number of your iPhone, if it's produced before 41th week of 2009 (old boot rom), it's on old bootrom and you need to download this file. Otherwise (new boot rom), you need to download this file. If you do not know which week it is produced, you can use this tool to check.
  2. Download Official iPhone 3GS iOS 5.1.1 firmware from Apple.
  3. Download latest Sn0wbreeze for Windows.
  4. Start Sn0wbreeze, choose your bootrom type from #1 and select expert mode.
  5. Choose install iPad baseband.
  6. Click Build IPSW and a custom firmware will be saved on your desktop.
  7. Follow instructions in Sn0wbreeze to put the phone in pwned DFU mode.
  8. Start iTunes. Shift+Click restore in iTunes and choose the custom firmware you just build. iTunes will start restoring firmware onto the iPhone.
  9. Once the restore is complete. iPhone will reboot.
  10. Start Cydia on iPhone. Wait for it to finish loading.
  11. Search for Ultrasn0w and install it in Cydia.
  12. Reboot the iPhone. Congratuations, your iPhone 3GS is now unlocked.

Did it work for you? Please leave a comment!



  1. How unlock my iPhone 4S, this is worked bath som wrong is ackept

  2. hi, currently I have a iphone 3GS locked (No wifi, no bluetooth) there are a solution when it is at this point, or maybe I need to buy another phone?

  3. the phone is bricked. you will need another phone sorry.

  4. Thank you for spending some time in posting and making this article..Nice post!

  5. Hi,
    You can unlock your iPhone 4 by remote unlocking, it is both simple and safe. A lot of websites offer this unlocking service. I unlocked my iPhone at, and found their service and support to be good. You can have a clear idea on how to unlock your iPhone using remote unlocking at…; this site gives you free instructions on how to unlock cell phones!!

  6. My iPhone 4 iOS 6.0 baseband 4.12.02 is iphone factory unlock without any problems! Thank you very much for recommending

  7. Thanks for the post.I would like to share my experience in unlocking my iPhone 4.I wanted to unlock it from the respective locked network but did not want to jailbreak it.As jailbreak makes the user to lose the warranty of the phone.I was also not comfortable in using the available unlocking tools.I searched and found that provides such a permanent unlocking service for iPhone models.They unlock the iPhone through the remote unlock service which would be a better option because,we need not give the mobile to someone else nor do we have any chance to enter the wrong unlock codes.This type of unlocking was very apt for me.I unlocked my mobile and now free to switch networks.

  8. This is the best information about unlock iphone 3gs


  9. I admire what you have done here. I love the part where you say you are doing this to give back but I would assume by all the comments that is working for you as well. Do you have any more info on this?
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