Hto-dzvoniv.info, known as “Who Called?”, is a community-run telephone directory and information-sharing project focused on phone numbers in Ukraine. It helps visitors look up numbers and read or submit comments about calls from businesses and individuals. Users can share experiences, flag suspected spam or scams, and learn about reported online fraud methods, helping others assess whether to respond to an unfamiliar caller or contact.

The site organizes its directory by region, city, mobile and commercial numbers, and also offers a forum and information about its rules. Its listings and comments are contributed by visitors, rather than presented as verified identity records. The project states that information may not be completely accurate and that commenters are responsible for what they post. Submissions undergo automated checks and subsequent moderation under the site’s rules. Hto-dzvoniv.info says it does not endorse opinions in comments or guarantee their accuracy, and provides an email address for requests to remove comments in cases such as apparent spam or reputational harm.