Curious how to set up a PIN code on your iPhone's SIM card to prevent things like the recent issue with iMessage not de-activating on stolen iPhones? If you're concerned about security, it's probably something you want to do sooner rather than later.
That's it! Now, if your iPhone gets lost or stolen, your SIM card will remain safe and secure and the new "owner" will have zero ability to send or receive iMessages, or do anything else nefarious with your number.
NOTE: If your iPhone does get lost or stolen, PIN code lock or not, call your carrier immediately to report it stolen and get it deactivated. The PIN code is the temporary solution. The carrier raining down deactivation on their pilfering heads is the permanent one.
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