Learn in the textbookInfrastructure Foundations of Mobile Communications
DefinitionMobile communication (モバイル通信) is how a smartphone or similar device uses radio waves to make calls and exchange data on the move.
ExplanationA device links by radio to a nearby base station (the equipment that serves as the radio-side front desk), and the carrier's network takes things from there to the other party. 4G and 5G name the generations of this technology. Tethering, which lets a PC or other device share a smartphone's line, also runs on top of it.
AnalogyA landline only works as far as its cord reaches. Mobile communication is like unplugging only the cord at your end and taking the phone out into town.
Memory hook"Mobile" means able to be moved. Japanese calls a phone you carry around モバイル after the same word.