All you have to do to create your AT&T account is go to the myAT&T sign-in page with your billing zip code and either your AT&T phone number or account number. You may even already have an account, if you have other AT&T devices or services. From there, just follow the prompts. Your AT&T account allows you to view and pay your bill online, combine your services into one convenient monthly bill, manage your accounts and even sign up for paperless billing.