unlocking iphone 4.2.1?

The unlock code varies from individual handset to handset. when it comes to unlock your mobile i recommend you to choose the right and reliable vendor ,have searched in the net for reliable solution to unlock the phone and found the site Wickedunlock.com. As they are providing the unlock code at low cost and more over over they are providing the permanent unlock solution for the phone ,It is because they have good reviews on most of the mobile phone forums. I got my phone unlocked successfully from that website. I think their codes don't fail.