Why do I see certain pop-up windows on AT&T Worldnet Service?
Pop-up windows can be a convenient way to communicate useful information or online content. AT&T Worldnet Service has pre-populated the “allow” list with certain non-ad pop-up windows that support particular AT&T Worldnet Service features or important customer service notices. Please try to avoid using the “Clear List” button on the “allowed” list so these pre-populated pop-up windows remain on the list.