Fujitsu arrows U User Manual page 79

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, 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, (Settings)
Security & location
Advanced
SIM card lock Change SIM PIN
OK Enter new PIN
OK
PIN is changed.
77
Enter current PIN
OK Re-enter new PIN