Japan Phone GuideMobile phones in Japan, made simple.
Phone

SIM-free / unlocked

A phone with no SIM lock, which can be used with any compatible carrier's SIM.

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Network use restriction (○ / △ / × status)nettowāku riyō seigen
A carrier's power to block a specific handset from its network by IMEI — used mainly when a device bought on instalments is not being paid for, or is reported lost or stolen. A used phone is commonly graded ○ (clear), △ (instalments still being paid) or × (restricted / blocked).
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