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You should lock your SIM card before someone else does

Protect yourself against SIM swapping and more security threats by setting up a SIM PIN right now.
BBC

How to set up a SIM pin

Settings > Security and Privacy > More security settings > SIM card security > Toggle on 'Lock SIM card' > Follow on-screen instructions from here. It may ask for a ...
PC Magazine

SIM lock

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...

Android 17 wants to solve the biggest headache with using SIM PIN locks

Google’s system basically keeps all the security of a SIM PIN, while removing all the inconvenience. Just make sure you jot down the Android-managed PIN somewhere secure, in case your phone ever dies ...

Android 17 could make SIM PIN lock headaches a thing of the past

Beta 2 gives new clues ...