A small integrated-circuit card inserted into mobile devices that stores subscriber identity and network information (SIM card).
新しいスマホにSIMを入れて初期設定を行った。
I inserted the SIM into the new smartphone and completed the initial setup.
海外旅行では現地のプリペイドSIMを買うと通信費を節約できる。
When traveling abroad, buying a local prepaid SIM can save on communication costs.
SIMのサイズが合わないときはアダプターを使うか交換が必要だ。
If the SIM size doesn't fit, you need to use an adapter or replace it.