Set Up a PIN on Your SIM Card — It Takes 30 Seconds
If someone steals your phone and pops your SIM card into another device, they instantly receive all your calls and text messages — including the verification codes that protect your bank, email, and social media accounts. Most SIM cards ship without a PIN, which means this works by default.
Setting a SIM PIN takes 30 seconds in your phone settings. Once enabled, anyone who removes your SIM and inserts it elsewhere will be asked for the PIN before the card activates. It is one of the simplest and most overlooked security measures. The default PIN is in the documents that came with your SIM, or your carrier can tell you — change it to something only you know. Be careful: too many wrong attempts lock the SIM, and you will then need the PUK code from your carrier or a new SIM.
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