make an online bill payment without signing in. Provide your account number or active at&t phone number and your zip code. go to att. com/pay. Sign in, if asked. Choose the bill you want to pay, if you have multiple accounts. To pay more than one bill, repeat these steps for each account. you can pay your at&t wireless and other at&t bills online without even signing in. Or, if you’re looking for more options, you can pay your at&t bill through the myat&t app,. the at&t support center provides…