I just unlocked my jailbroken 4S without having to restore. I bought the code from UnlockFusion on eBay last night for $6.75. They sent me an email with a link to send them my IMEI. Five hours later they sent me the confirmation email that my phone was now unlocked and directions for applying the unlock - which included a restore.
I bypassed the restore process and completed the unlock in less than a minute with the SAM jailbreak utility.
1. In Cydia add repo: Binger.com
2. Install SAM
3. Settings > SAM > Utilities > De-Activate iPhone (clear push)
You'll now get a screen saying your phone is deactivated. Keep your AT&T SIM in your phone. Now open iTunes and connect your phone. Make sure you're running the latest version of iTunes. iTunes will reactivate the phone as unlocked and you'll get a message saying the phone is now unlocked.
Verified unlocked with a T-Mobile SIM card:
I bypassed the restore process and completed the unlock in less than a minute with the SAM jailbreak utility.
1. In Cydia add repo: Binger.com
2. Install SAM
3. Settings > SAM > Utilities > De-Activate iPhone (clear push)
You'll now get a screen saying your phone is deactivated. Keep your AT&T SIM in your phone. Now open iTunes and connect your phone. Make sure you're running the latest version of iTunes. iTunes will reactivate the phone as unlocked and you'll get a message saying the phone is now unlocked.
Verified unlocked with a T-Mobile SIM card:
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