First let me start by saying this is NOT my guide. I simply followed it completely and it worked without a hitch! All credit goes to Saltey over at Modmyifone
ALSO this is NOT for OTB 1.1.2 iPhones!!!!

[Pre-Guide] UNLOCK 1.1.2 (windows) long
This is a Pre-Guide (windows); hopefully somebody will put time into making a full guide out of this:

*This will fully unlock iPhone ( 1.0.2 virgin or virginised and working 1.1.1) to work with any network with functional YouTube.
*know issues for US iPhone users outside US http:code.google.compiphone-elit…phone_sms_apps
*No Known issues for US iphone for US users.

*This will not virginise or UnBrick you phone so start with a working virginised 1.0.2 or any working 1.1.1.
*OF COURSE YOU NEED WI-FI.
*this method was used on a US originally 1.1.1 OTB (not sure it would work on 1.1.2 OTB, i dont see why not). So it should work on 1.1.1 OTB and lower for sure.
*This pre-guide is for EXPRIENCED users only, you should know how to use winSCP or FileZilla , and know how to move files fo and to iPhone brefor using this Guide .

*it is best to have those files handy:

- Firmware 1.0.2 and 1.1.1 and 1.1.2
- iTunes 7.4 (7.5 didn�t work for me) “in pack”
- iBrickr v0.91 “in pack”
- iAsign “in pack”
- anySIM 1.2u “in pack”
- lockdownd 1_1_2 “in pack”
- Filezilla sftp (winSCP didn�t work for me) “in pack”
- WiNnstaller “in pack”
- AppTappinsaller “in pack”
- 1.1.2_jailbreak “in pack” download new version here http:conceitedsoftware.comiphonesite112jb.html

Download pack http:rapidshare.comfiles698482301.1.2pack.zip

- you will also need 2 sim cards one AT&T non-activated card and a T-Mobile sim card (or any Non-AT&T)

Cycle

* 1.1.1 or 1.0.2 ===> 1.1.2 ====> 1.1.1 ====> 1.0.2 ( this will put modem firmware 04.02.13_G @ 1.0.2)

* jailbreakactivateunlock in 1.0.2 (this will unlock modem firmware 04.02.13_G @ 1.0.2)=======> 1.1.1 then jailbreakoktoprep (this will prep for 1.1.2 jailbreaking)

* update to 1.1.2 then jailbreakactivate ===> you will get activated and unlocked modem (04.02.13_G) @ 1.1.2

PLEASE READ THE WHOLE PRE_GUIDE BEFORE STARTING!!!!!!

1.(Update to 1.1.2.) Start with connecting you iphone with any AT&T SIM in it ( not the one legally activated )to iTunes and sync , then press update , this will update your phone to 1.1.2 and you modem to (04.02.13_G) , when it is done a picture of a plug will appear on the iphone and it will tell u to slide to unlock in Gibberish, on iTunes it will tell you, that you need iTunes 7.5 or higher to activate you phone.

4.(Jailbreakactivateunlock) A. Using WiNstaller(will close iTunes automatically) and the unactivated AT&T SIM in the phone, click Activate ( This will jailbreakActivate )and wait till its done , then you see phone activated press ok then you will see your springboard. Open appTappinstaller on you computer and chose firmware 1.0.2 then install the Installer.app ( the blue Icon in the Iphone SpringBoard you will see later) then it will restart and wait for it to go back on main springBoard.

B. Connect to Wi-Fi and click the Blue Installer icon, and wait for it to refresh, it will tell you that it found an update, click install and after its done click the home button and wait for the iphone to do a soft reset then slide to unlock. Using the same method install Community Sources+ BSD Subsystem+ OpenSSH in that order and click the home button and wait for the soft reset after each install.

B. Don�t worry if you are not getting signal on you phone , you are not suppose to on Firmware 1.1.1 .Now click the Blue Installer icon, and wait for it to refresh, it will tell you that it found an update, click install and after its done click the home button and wait for the iphone to do a soft reset then slide to unlock. Using the same method, install Community Sources+ BSD Subsystem + OpenSSH in that order and click the home button and wait for the soft reset after each install.

C. Restart you iPhone and try to connect to it using FileZilla or WinSCP Username: root , password :alpine and port:22, the first try will take about a minute to connect, when you connect close filezilla and open iTunes, Sync or setup if you have to and make sure you are on the main screen with update and restore buttons available. NOW on your phone click installer ( blue icon) and install Oktoprep it is under tweaks 1.1.1. and wait for it to say it is ok Blah bLah blah , then press home button and wait for a soft reset.(( do not restart phone ))

6.( update to 1.1.2) A. On iTunes press update . it will update you phone to 1.1.2 without errors , wait for it to finish, a picture of a plug will appear on the iphone and it will tell u to slide to unlock in Gibberish, on iTunes it will tell you, that you need iTunes 7.5 or higher to activate you phone.

C. ( only use with 1.1.2 jailbreak in pack see step above) open FileZilla ( winSCP didn�t work for me at this point ) then connect to your phone ,the first try will take about a minute to connect put your IP address where it says Host : 192.168.0.100 in my case , Username: root , password :alpine and port:22 ,on you computer open the lockdownd 1_1_2. On you phone go to usrlibexec and rename the lockdownd file in usrlibexec to lockdownd.bak the copy the lockdownd file from loackdownd 1_1_2 to userlibexec on your phone and set permissions on it to 755 on fileZilla ( Octal 0775 on Winscp ) then restart your phone.

########## Congrats you have an unlocked iPhone with Firmware 1.1.2 #########

for more info —
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Activate, Jailbreak, and Unlock Firmware 1.1.2 non OTB

geohot’s untethered jailbreak for the ipt2/3gs/ipt3…and ipad? iphonejtag.blogspot.com Song was originally “Don’t Tell Me It’s Over” by Gym Class Heroes but it kept getting muted by youtube. So you get this instead.