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If you are using a pc, and like the AppTapp/PAYCAY/iBrickr - .pxl method this is the guide to use.

Files:
Download: AnySim 1.1p...unfortunately this is being posted from my iphone and i cant post a link. but go to iphone.exploit.org/pxl and it is on there
Download: http://ibrickr.com/downloads/ibrickr_v0.8.zip
Download: http://www.nullriver.com/~adam/AppTappInstaller.exe
Download: http://rapidshare.com/files/55289251/PACAY__by_brasuco_.rar.html ...(Thanks again Brasuco)

Also:
Download: http://appldnld.apple.com.edgesuite....8_Restore.ipsw
- in case you need to restore without being connected to the internet.(Recommended now)
And:
Download: http://appldnld.apple.com.edgesuite....TunesSetup.exe
- If you dont have 7.4.1.2.

To Check your firmware version check here: http://www.hackint0sh.org/forum/showthread.php?t=8221 (thanks gaz919)

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)(if you already have 1.0.2, plug your iphone into your pc and skip to step 7. If you have 1.1.1 Donate to the Dev team, and wait a little while.) 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. Hold the Shift Button and hit restore. Select the 1.0.2 firmware you downloaded above. 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.)

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 YOUTUBE. 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.

10) Go back to main screen on iBrickr, and press applications. Click file, select anysim1.1p pxl. Install it, and it will soft boot your phone when done.

11) keep phone connected to pc, move slide to get back to springboard. press the anysim icon near the bottom of the screen. Move the slide on anysim, scroll to the bottom and press the unlock button at the bottom.When it completes turn off iphone. take out ATT sim, hold it in the air and say " This sim has been freed by The Liberator! AKA CarlosValdosta!!!"

12) Put in your sim, make sure that the slanted edge is in the right way.

13) Turn on your unlocked iphone.

14) Use iBrickr to remove the unlock.app. ( go to applications. look at fake iphone on right...click on little red circle next to the anysim1.1 line.

17) Take the plastic off of the phone if you havent already.

16) Be the envy of all your friends.

Signing off... "The Liberator"...CarlosValdosta

(For those of you interested in removing the install from springboard, open iBrickr install Installer.pxl again found here : http://iphone.exploit.org/pxl/Installer-2.63.pxl, then go back in and uninstall it.(Credit goes to someone on this board... Forgot where the post is)

it would be best if you also provide the download link of each program that you used, if its allowed here . To make it a comprehensive guide

yeah provide links to the exact software that u used...because so many versions are out on the web...please do! that would help us greatly!

I didnt on purpose. there are a thousand ways to get those files...

Yes that would be great Especially the 'unlock-fast.pxl' file

Thanks Carlos, looking forward to trying this. Come on Monday!!!

Also, in Step 9:

"9) Open iBrickr. Click applications. Install the installer. follow these instructions onscreen very carefully...you will have to completely restart your iphone twice during this process."

Which Installer are we installing? PXL?

It will save a lot of people time searching and some of us might end up getting the wrong file LOL. It a very nice guide though . Does everything works? Including bluetooth and Edge? SMS in/out, Calls in/out? Thanks much

will it work with no att sim in,i don't have it

ok ok ok....let me get the links

yes it will work with or without the sim!