Enabling Sim Pin - Sony Xperia User Manual

SIM PIN
PIN is the security code for your SIM Card. It prevents third parties from unauthorized
use of handset. At time of purchase, "9999" is set.

Enabling SIM PIN

Changing SIM PIN
Enabling SIM PIN
Enable SIM PIN to show PIN entry window when handset power is on with SIM Card inserted.
In Home Screen,
43
(Settings) Security