eSIM
eSIM ī-shimu
A SIM built into the phone that you activate by scanning a code or through an app — nothing physical is shipped.
An eSIM is downloaded to a compatible phone. Activation can be near-instant, which suits online-only plans. Downsides: moving an eSIM to a new phone is a procedure in itself, and not every device or every plan supports it.
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Activation / kaitsū開通kaitsū
The step that switches your line onto the new SIM and network. Until activation finishes, the new SIM has no service.
SIM cardSIMカードshimu kādo
The small chip that connects your phone to a mobile network. Comes in a physical form you insert.
SIM lockSIMロックshimu rokku
A restriction that ties a phone to one carrier. New phones sold in Japan are now generally sold without it, but older devices may still be locked.