As of April 2015, AT&T offers mobile device codes on its website, ATT.com. Codes are available for wireless AT&T phones or GoPhones. The codes enable users to access account services and information 24 hours a day, seven days a week.
AT&T GoPhone codes allow users to view account balance information, such as account balance, expiration date, remaining minutes and data available. In addition, GoPhone users can also use codes to refill their account balance using a refill card. Wireless AT&T phone subscribes can use codes to access customer services for free. Users can check their unbilled minute balance, remaining data available, invoice balance and upgrade availability.