You can pay your bill when you receive it or set up automatic payments.
Account management
When you register for AT&T online account management:
You will receive an email each month telling you that your bill is available online.
You can choose to stop receiving a paper bill and view your bill online, print a copy, or save an electronic version.
You must pay your bill each month by selecting the Make a payment button. You must pay at least two business days prior to the due date to avoid late payment charges.
You can pay your bill online every month using a bank account or credit card. You may choose to store your financial information for easy future payments.
With the automatic payments:
You will continue to receive a paper bill unless you stop your paper bill.
Your bill is automatically paid in full before your due date.
The AutoPay service uses the bank account or credit/debit card that you specified for the automatic payment service when you enrolled online.