Learn in the textbookIoT Devices and Information Terminals
DefinitionA mobile phone (携帯電話) is a phone that communicates with base stations (基地局) by radio, so you can make calls and use data while on the move.
ExplanationEach base station covers a fixed area, and as you move, the station handling your connection switches from one to the next. Today the mainstream is the smartphone, which runs apps and accesses the internet as well as making calls. Inside is an embedded system (組込みシステム), a computer system built into the device to control specific functions.
AnalogyLike a relay baton, your call is handed to the nearest base station as you walk.
Memory hookThe cell in cellular phone is the area (cell) that one base station covers.