Using Wi-Fi or mobile data on your phone, Kik is a free messaging software that enables users to stay in touch with friends and family. Signing up with Kik simply takes an email address; a phone number is not required. On the Kindle Fire from Amazon, iOS, Android, and Kik are all supported. How Do You Define "Kik"? You could have received a message from someone asking you to "Kik?" or "Kik me" on Tinder, Instagram, or Snapchat. Simply put, I'm asking to be included to your chat app. If you have a username, they will need it even if you might not want to add them.