But in the last several months, AT&T has been reducing the number and length of calls to its call centers by relying on so-called smart videos from New York City-based SundaySky. The videos are personalized tutorials that are built on the fly using pre-scripted clips mixed with the subscriber's own data. The system works off a video template that incorporates visual elements, narration and integrated information from a user's account. Users end up seeing a video bill that addresses them, acknowledges their recent account activity and leads them through their biggest billing questions.