John's Phone is a minimalist mobile phone that claims to be the world's most basic cellphone, allowing the user only to make and receive calls, with none of the features of modern smartphones such as a camera, internet access and text messaging. Phone numbers and addresses are written on a small physical paper booklet stored on the back.[1][2][3] It was designed, and developed by Hein Mevissen and Diederiekje Bok of Dutch advertising and design agency John Doe Amsterdam. It is marketed as being ideal for children, the elderly, and technophobes.[4][5]