Enable the SIM PIN to lock the SIM card to
a modem so it can't be used until the correct code is entered to
access the cellular network. PIN verification is triggered after every
modem reset. You get three attempts to enable the SIM PIN.
A
yellow triangle adjacent to the lock icon indicates failed PIN verification.
A red lock indicates PIN validation failure after the third failed
attempt, after which the SIM is blocked. A PUK (Personal Unblocking
Key) from the provider is required to
Unblock SIM PIN. A
Device_Cellular_SIM_PUK_Needed alarm is raised when the
SIM is blocked after three failed attempts.
When the
active SIM is blocked, an automatic switchover to a secondary SIM,
if present, happens.