IPA: /ˈsmɑːrtfoʊn/
KK: /ˈsmɑrtˌfoʊn/
A mobile device that combines a phone with advanced features like internet access, apps, and a touchscreen.
I use my smartphone to check emails and browse the internet.
Smartphone → It is formed from "smart" (from Old English *smeart*, meaning quick or clever) and "phone" (from Greek *phone*, meaning voice or sound). The word "smartphone" refers to a device that is clever in its functions and capabilities related to voice communication and more.
Think of a device that is 'clever' ('smart') and relates to 'voice' ('phone') — that's why a smartphone is a clever device for communication.