Called the Tin Can, the phone came out last April and has since sold more than 100,000 units without much paid advertising. It’s basically a “dumb phone” that makes and receives calls over a Wi-Fi network—a landline without the line. It has no screen, not even a tiny one to show who’s calling; its surface has only buttons, a receiver, and a speaker. The product is marketed to parents who want to encourage their children to communicate without giving them access to web browsers and social media. (One user on X suggested, jokingly, that children start writing chain letters next.)