(1) For the plug and socket, see
mini-phone connector.
(2) A smartphone with a small screen. Although large-screen iPhones and Androids are very popular, there are more modest smartphones that cater to people in markets worldwide that cannot afford or do not need high-end models.
Unihertz Jelly 2E
This Android mini phone from China has a 3" screen and essential hardware, including Wi-Fi, Bluetooth, GPS, fingerprint/facial recognition and even an FM radio. (Image courtesy of Unihertz.)