Sony Xperia XZ2A Manual page 180

PIN is enabled.
PIN Cautions
Entering incorrect PIN three consecutive times activates PIN Lock. To cancel, Personal
Unblocking Key (PUK) is required; contact
consecutive times locks SIM Card, disabling handset. For recovery, SIM Card must be
reissued at a SoftBank Shop (fees apply).
Changing SIM PIN
First enable SIM PIN to change PIN.
In Home Screen,
xperia-xz2a_11_Handset Settings.docx
16
(Apps) (Settings)
Customer Service. Entering incorrect PUK ten