UPDATE: I just did this myself and can confirm with first hand experience that the information contained in this post is 100% accurate. Don't settle for a rep that doesn't know what he's talking about.
READ THIS FIRST
DO NOT TURN ON YOUR PHONE UNTIL THE UPGRADE SWAP IS DONE!
If you post your experiences please note your results and if you bought the phone through AT&T or Apple.com.
The IMEI and ICCID number can both be found on the box.
This has been confirmed to work whether you bought the phone from AT&T or Apple.com. Just don't turn the phone on until the entire process is done. Don't assume the rep knows what he/she is talking about when they tell you to turn it on.
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The following is a quote from user MajecticNJ who shared what others on the thread have also shared that's worth knowing. This seems to be the case for everyone who has done an upgrade swap over the phone with AT&T, putting it here to save you the trouble and reading the entire thread.
From AT&T:
Jhttp://www.att.com/esupport/iphoneupgradesupport.jsp?source=ECSAFBFAC00D1000S
READ THIS FIRST
DO NOT TURN ON YOUR PHONE UNTIL THE UPGRADE SWAP IS DONE!
If you post your experiences please note your results and if you bought the phone through AT&T or Apple.com.
The IMEI and ICCID number can both be found on the box.
This has been confirmed to work whether you bought the phone from AT&T or Apple.com. Just don't turn the phone on until the entire process is done. Don't assume the rep knows what he/she is talking about when they tell you to turn it on.
--------------------------------------------------------------
The following is a quote from user MajecticNJ who shared what others on the thread have also shared that's worth knowing. This seems to be the case for everyone who has done an upgrade swap over the phone with AT&T, putting it here to save you the trouble and reading the entire thread.
-----------------------------------------------------------------"I called the 800# and selected option 2 as suggested. The rep was very helpful and had no issues with my request. She understood fully what I was doing and even asked if my wife knew I was using her precious upgrade for my own phone!
The process was pretty much painless. Was done in less than 10 minutes.
ONE HITCH that kinda bothered me was when I powered the phone up and went through the initial setup (after the rep told me to) I got to the point where it said "Please confirm that the number is the phone you are upgrading, if it is not you must call AT&T to change the phone." or something to that effect. I was VERY hesitant to move forward because it showed my wife's number there but I did it anyway. When the phone came back up after a reset it had my number in it and my wife's phone is still working as it should."
From AT&T:
"f the number you used to order your device is NOT the number you intend to use with your iPhone, follow these simple steps when your device arrives and an AT&T representative will help you activate.
1. Charge your device if needed
2. Contact AT&T at 1-800-331-0500 or 611 from a different wireless device. At the prompt, enter the wireless number that you used to place your iPhone order.
3. At the next prompt, choose option #2 to activate your phone on a different mobile number, and an AT&T representative will help you from there.
4. After speaking with an AT&T representative, turn on your iPhone, follow the on screen instructions and choose a Wi-Fi network. If Wi-Fi is not available, connect your iPhone to your Mac or PC with iTunes (www.itunes.com) and follow the on-screen instructions."
Jhttp://www.att.com/esupport/iphoneupgradesupport.jsp?source=ECSAFBFAC00D1000S
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