--Updated--
If you are using a pc, and like the AppTapp/PAYCAY/iBrickr - .pxl method this is the guide to use.
Files:
Download:
http://sendspace.com/file/7phdz9
Download:
http://ibrickr.com/downloads/ibrickr_v0.8.zip
Download:
http://www.nullriver.com/~adam/AppTappInstaller.exe
Download:
http://www.linkhider.com/Txc5
First off, I am doing this as a "From Box to Unlock" method. If you've f'ed up your iphone using some other method, i may be able to help, but this is what i have done, now 14 times, without a single issue.
Rule #1 - READ ALL INSTRUCTION STEPS BEFORE DOING THEM.
Rule #2 - have fun with your unlocked iphone.
1) Open Box. take out iphone... it should turn on...Turn it off (red slide).
2) Check to make sure itunes is ver 7.4.1.2. If not download it.
3) Close itunes. make sure ituneshelper is terminated in processes under the task
manager.
4) Plug usb cable into PC. plug other end in iphone, and as soon as the gray apple appears, hold power button and home button down at same time. Keep holding the buttons down. your iphone will reset itself 2-3 times before you get a yellow triangle.
5) Open itunes. It will say it needs to restore your iphone. hit restore iphone in itunes. this should take about 5 minutes(depending on pc i guess)
6) Wait for everything to finish, and it is back on the activation screen.
7) Close itunes. open up AppTapp. Click continue. Select 1.0.2. Hit continue.
****this is very important... i have seen were AppTapp hangs...it will say that it is copying files, but never does, or it will go thru it very fast...3 seconds or so, and says it is done...IT IS NOT. The way you can tell it actually works is if your iphone restarts and goes to the yellow triangle screen, then back to the activation screen.***(Also... AppTapp will complete, but the status bar won't be all the way over to the right. This is fine, just a bit of bad coding.)---
FINISHED NOT WITH FULL STATUS BAR SO ITS CLOSED AND WROTE COMPLETED
8) Close AppTapp. Open PAYCAY, run the (CLICK HERE) activate.bat. it will start to copy files to your iphone. it will also activate your itunes.-
NO ACTOVATION ON PC OR SCREEN???ALSO I WAS SITTING AND WATCHING ONE WORD COPYING FILSES TO IPHONE FOR AND HOUR SO I CLOSED. AFTER THT TRYED OE MORE TIME AND JUMPED SCREEN ON PC - RWSTORING SO LINES WENT FOR AND HOUR AND NOTHIN?????????WHAT A TRASH THAT UNLOCKING???????????????? Follow the instructions on the screen...when it tells you to restart your phone turn your phone off(red slide). Leave it off for about 15 seconds, turn it on. you should now see the springboard(not the Waiting for activation screen). ( I have had some questions about the Lockdown file being replaced... if you wacth the script run, you will see it do it for you.)
9) Open iBrickr. Click applications. Install the installer.pxl. follow these instructions on screen very carefully...you will have to completely restart your iphone twice during this process.
HOW TO UNLOCK IT??????????????