Learn in the textbookInfrastructure Foundations of Mobile Communications
DefinitionIn mobile communication, roaming (ローミング) lets you use communication services outside your own carrier's coverage by borrowing a partner carrier's network.
ExplanationThe classic example is international roaming, where you use your own smartphone abroad as it is. Your contract stays with the original carrier, and the charges usually come from that carrier as well.
AnalogyIt is like withdrawing from your own account at a partner bank's ATM in a place where your bank has none.
Memory hook"Roam" means to wander about. Picture yourself wandering past the edge of your carrier's signal.