I see that lots of newbies are asking same question over and over again.
Here is the step by step instructions for people who has bran new ipod and running windows XP
Use this
http://iphone.unlock.no/
Your iphone does not come with required firmware so when you connect your iphone and run ibricker it will tell you to update it.
Plug in the iPhone to your computer, first making sure iTunes is quit.
Connect your iPhone to the computer.
Press and hold the Sleep and Home button on your iPhone for about 25 seconds until it displays "Please connect to iTunes" and has a picture of a yellow triangle. It will appear to turn off and back on during those 25 seconds. Don't worry, this is normal.
Now, open up iTunes. You should see message says Itunes has detected iphone in recovery mode, hit OK and complete the necessary steps to restore and update the iphone. you will know when it is done.
Now this is the part where you go around activating process. Run ibrackr and follow the screen instructions.
and last follow the steps here
http://iphone.unlock.no/
starting from step 1 for rest of the process
one you come the step before the last one where it says type commands
AT+CLCK="PN",0,"00000000"
AT+CLCK="PN",2
if yo get an error after
AT+CLCK="PN",0,"00000000"
quit minicom rn bbupdater -v then get back into minicom and last skip the part
AT+CLCK="PN",0,"00000000"
just enter
AT+CLCK="PN",2
you will be fine. Finaly and last complete the last step on
http://iphone.unlock.no/