Explain this unlock... Does it hold up between iOS upgrades? Is it any hacking on your end or just wait for the heads up and then restore from iTunes? If its not kosher to post a link here can you direct message me? ^_^
Hey yeah it was recommended to me by another user of these forums. Just do an advanced search, choose "By Seller ID" and search the ID "unlock_fusion". They were extremely fast... After you do buy-it-now, they e-mail you the link to a site where you login and input your IMEI.
They guarantee the unlock within 48 hrs, but I received notification that my unlocks went through 2 hrs later. I bought Qty: 2 of their unlocks because I was doing my phone and my wife's, and it gave me 2 "credits" when I logged into their site so I was able to input 2 different IMEIs.
Once you receive notification that the unlock is complete, you just backup your phone in iTunes (connect via USB and backup to the computer), then click "Restore" (not Restore from Backup, just plain Restore). After it wipes your phone and reboots, you'll see the "Congratulations your iPhone has been Unlocked" screen in iTunes and then you can restore the backup.
From the research I did, the unlock is permanent no matter how many times you wipe, restore, upgrade, jailbreak, etc., and unlock_fusion offers a "lifetime guarantee" on their unlock. I have no idea how they accomplish it - my guess is that they pay off some low-level AT&T employee to toss IMEI's into their white list. I suppose it's possible that someone could discover their scheme and then un-whitelist those phones, but I expect that it's very, very unlikely.