Smart phone is a mobile device, the has the features of a traditional mobile phone, but also the advanced computing capabilities.
Usual built-in advanced hardware capabilities: touchscreen, camera, GPS, fast access to the Internet, magnetometer, proximity sensor, barometer, gyroscope, acelerometer, LTE, 5G, 4G, Wi-Fi, Bluetooth.
Devices and technologies replaced by smart phones
telegram, calculator, landline, telephone booth, databank, postcards and letters, compact camera, mp3 player, mp4 player, tablet, paper newspapers and magazines, gps navigation, portable dvd player, pager, payment cards and credit cards, alarm clock, "hi-fi towers, radio tape recorders and other players", PDA, dictaphone
External link: https://www.youtube.com/watch?v=um9j3AXkZvE