If you’re among one of the unlucky few that upgraded your iPhone 4 to iOS 5.1.1 without having the foresight to preserve your baseband and are now stuck with 04.12.01 Have no fear my friend for I have done the exact same thing and luckily found a viable solution. This method only work for US GSM iPhones on AT&T provided that your iPhone isn’t reported lost or stolen and its not currently under any contract.
After the update to iOS 5.1.1 was successful I realized that I cannot my activate my iPhone with my Tmobile sim card. My trusty gevy turbo sim does NOT work on baseband 04.12.01
I am now stucked on the activation screen without anyway get into the phone. So I frantically google for possible solutions. I read about the recent loktar_sun SAM unlock exploit, ultrasnow, and found many sites thatpromise to unlock any baseband on any ios version for a small fee of $29.99
I was too late to the party for the loktar_sun exploit, Apple had already patched it. I didn’t trust those websites that claim to do the impossible.
I found Scambook.com and sure enough one of those sites I found was on there.
All these sites are scams. Do not give them your hard earned $.
The one link that saved me was an article posted on OSXdaily.com
I followed their instructions and got my iphone 4 unlocked for free without having to waste my $ on those scam sites. Instead of an expensive iPod I now have a fully factory unlocked phone that work with any SIM card anywhere in the world.
It took some leg work because you need to have a friend with an AT&T account that’s willing to let you use their account or better yet do it for you.
Once you have access to an AT&T account, per the instructions, you need to visit
- State that you would like to unlock an off contract iPhone and provide the iPhone IMEI number
- Let the AT&T representative check if the iPhone is indeed without a contract and give them an email address when asked
If everything checks out, the AT&T rep will provide you with a case number and an estimated date of completion for resolution.
I used iTools 2012 http://limelinx.com/files/e62bcc58b6d007b1cc516b894fba4817 to get the IMEI info. You can also retrieve this # if you have access to the phone by dialing *#06#
The process was simple enough. I connected to the chat and told the AT&T rep I needed to have my off contract iPhone unlocked. She asked for the IMEI # and after verifying that its not reported lost or stolen she agreed to unlock it for me.
The post unlock instructions that she provided via email is a link to a PDF file explaining how to complete the unlock.
Also available @ iPhone_unlock_email_sample
Once the unlock is complete you’ll see this message in iTunes.
You now have a fully unlocked iPhone. You can pull out your gevey SIM interposer and just use your modified Tmobile sim. Your iPhone should now recognize it without any problems.
Visit http://greenpois0n.com/ to download the latest version of absinthe and jailbreak your phone.