I was having a hard time finding out how to pay my ATT bill with my "Promotional Card" that I had received when I had sent in my old iPhone 4. Several websites indicated there where "hacks" to be able to get this to work and after contacting the website on the card www.att.com/tradein and calling the 1-877-659-1886 number I was directed to go to an ATT retail store (not a authorized retailer). Finally I found that the website has been updated and you can do it all online now as of 1/2015.
- Log into your ATT account
- Click on the "Make a Payment"
- Note if your have auto-payment enabled you may need to alter it for the month