I got the email last night from AT&T that the unlock request for my iPhone 6 Plus has been approved. The instructions say: Please allow 24 hours upon receipt of this notification to complete the unlock process. 1. Open iTunes on your Mac or PC and verify that you have Internet connectivity. 2. Ensure the original SIM card that came with this device is inserted in your iPhone. When they say "original SIM" does it have to be the SIM that was shipped with the phone or the AT&T SIM that I moved over from my iPhone 5S?