What is a SIM PIN code and how to unlock a SIM card with a PIN? | Android Central
Sim Lock: How to enhance your SIM-security by setting up SIM PIN lock
Amazon.com: CKANDAY 2 Packs SIM Card Holders with Tray Opener Pins, Card Storage Tool Set for Standard Micro Nano Micro-SD Memory Cards, with 3 Card Adapters and 1 Eject Pins - Black