Piece of advice for all those trying to get the max value for these credits: AT&T only allows $300 in credit but if your balance is under $300cr (for example 299cr), it will allow you to make additional $200 payment. So if your balance is at $0 and you would like to get the most credit possible, make a $200 payment, and then a $99 payment, and then another $200 payment. You will now have 499 in AT&T credit. Hope you guys understand. Just trying to be helpful