Kik Messenger, commonly called Kik, is a freeware instant messaging mobile app from the Canadian company Kik Interactive, available free of charge on iOS and Android operating systems. It uses a smartphone's data plan or Wi-Fi to transmit and receive messages, photos, videos, sketches, mobile webpages, and other content after users register a username. Kik is known for its features preserving users' anonymity, such as allowing users to register without providing a telephone number. However, the Kik application logs user IP addresses, which the company can use to determine location. As of May 2016, Kik Messenger had approximately 300 million registered users, and was used by approximately 40% of United States teenagers.