Changing Sim Pin - Sony Xperia1 IV User Manual

PIN is enabled.
PIN Cautions
Entering incorrect PIN three consecutive times activates PIN Lock. To cancel, Personal
Unblocking Key (PUK) is required; contact Customer Service. Entering incorrect PUK
ten consecutive times locks SIM Card/eSIM, disabling handset. For recovery, SIM
Card/eSIM must be reissued by SoftBank (fees apply).

Changing SIM PIN

First enable SIM PIN to change PIN.
In Home Screen,
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Handset Settings
(Settings) Security