How to unlock an iPhone 3gs (new bootrom)?

How can I unlock my iPhone 3gs new bootrom?
I used Absinthe 2.0.4 to jailbreak my iPhone.
I understand I'm (might/am) have/going to, to flash my baseband to the iPad baseband: 6.15.00.

Specs:
Capacity:16 GB
IOS: 5.1.1
Baseband: 5.14.02
Serial #: xx133…
No SHSH saved (don't know how to do that) haha

Can somebody take me through the steps on how I do unlock my iPhone 3gs?

Thanks!

Added (1). Would perfer to be JAILBROKEN AND UNLOCKED on IOS 5 if not then IOS4

To Unlock I-phone 3GS use Remote Unlock service… Visit the site http://www.simpleunlocking.com/apple-iphone-3g-s/rs16wp9/ get the remote Unlock service and unlock it easily… Follow the steps below to unlock it correctly… You need to update to the latest version…

Apple iPhone 3G S Unlocking Instructions:

1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 3G S phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 3G S to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 3G S.
6. Disconnect your Apple iPhone 3G S and reconnect it after 10 seconds.
7. Your Apple iPhone 3G S is now unlocked.