Hi there folks! Today we have a guide for you to unlock iPhone 4 using Gevey SIM. But before you proceed, let me remind you how important it is to preserve your old baseband. The baseband that is eligible for unlock should be protected with all your effort as losing it would mean you can’t unlock your iPhone. iTunes can update your baseband while updating to iOS 5.1.1.

Unlock iPhone 4 with Gevey SIM

Ultrasn0w 1.2.7 can unlock older basebands on iOS 5.1.1. However here the basebands which can be unlocked via Gevey:

  • Baseband 02.10.01
  • Baseband 03.10.01
  • Baseband 04.10.01

Guide to unlock iPhone 4 using Gevey sim

Step 1: Do a full restore, after that, eject the SIM card from the iPhone and reboot it.

Step 2: Switch off the Cellular data and 3G.To do this, go to Settings > General > Network.

Step 3: Insert Gevey sim and sim card together in your iPhone 4.
Gevey Sim Unlock iPhone 4

Gevey Sim Unlock iPhone 4 iOS 5.1.1 Firmware

Step 4: Now the accept screen will appear. Tap on Accept.

Step 5: Now you are likely to see No Service. Don’t worry! Wait for 15-20 seconds and dial 112 and hang up after a couple of seconds.

Step 6: Turn on the Airplay Mode and wait till you see the No SIM card installed message! Now turn off the Airplay mode. No SIM Failure would appear. Press Ok and the iPhone should be connected to the network.

Easy isn’t it? If you follow this tutorial correctly, the iPhone 4 would be unlocked on iOS 5.1.1 using Gevey. Those with GSM & CDMA iPhone 4S can use Gevey Ultra S for basebands up to 2.0.12 to unlock their iPhones. Feel free to comment below!

Update #1: After few years, we decided to update this article. We are strongly recommending you to use a factory unlock service to unlock your iPhone 4. Because the Gevey Sim solution is not permanent – it’s a temporary solution and you can’t update to the latest iOS version.

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Stephan Popov
When iDevice users experience problems with the iOS software or unlocking, it is not uncommon for their lives to unravel. My passion is providing answers to your problems. I help iPhone, iPad and iPod Touch users by recommending fixes for common iOS bugs and tools that improves your experience. I conduct in-depth research for every topic i cover on this blog, to ensure that I cover everything Apple users need to troubleshoot their issues. When not writing for UnlockBoot, i enjoy swimming in my backyard pool. P.S. i prefers the Maldives for holidays. Connect with me on Facebook, Google Plus and Twitter.