You should lock your SIM card before someone else does
Your SIM card is far more important than you probably realize. It's not just the chip that is assigned to your phone number and contains crucial network authorization data. It can store contacts and other small amounts of data, but more importantly, it's the key to accessing two-factor authentication codes linked to your phone number. Your phone probably has a PIN or password securing it, although that doesn't stop anyone from removing your SIM card and inserting it into a device they control. It's called "SIM swapping," and it could allow bad actors to hijack your most important internet accounts in the event your device is lost or stolen.
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