Find My iPhone is a great way to protect your iPhone if it’s lost or stolen, but it doesn’t include a SIM protection feature. Without a SIM PIN, anyone with access to your device can use it to make phone calls, send messages, and other cellular services.
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Installing a personal identification number on your SIM card is a great way to add another layer of security to your phone and make sure that even if the device itself is compromised, the cellular plan can remain somewhat secure.
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How to Disable or Change SIM PIN on iPhone
1. Select “Settings” → “Cellular” → “SIM-PIN” and turn the switch to position Off.
On a device with iOS 11 and earlier, the toggle “SIM-PIN” placed along the way “Settings” → “Phone” → “SIM-PIN”.
2. To disable the PIN code, enter the current PIN code to confirm and press “Ready”.
3. To change the PIN code, enter the current PIN code and then the new one and press “Ready”.
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How to enable SIM PIN on iPhone
1. On an iPhone running iOS 12 or later, select “Settings” → “Cellular” → “SIM-PIN” and set the switch to position On.
On an iPhone with iOS 11 installed and earlier, this switch is located along the path “Settings” → “Phone” → “SIM-PIN”.
2. As a rule, you must enter the PIN code for the SIM card that was used before it was turned off (4 to 8 digits). Then click “Ready”.
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What happens when the SIM PIN is enabled?
Each time the user restarts the iPhone, or inserts the SIM card into another phone, the user will need to enter the SIM PIN to unlock it. As mentioned above, this is a great way to protect the SIM card and ensure that if thieves steal the iPhone, they can’t reuse the SIM card on another phone.
Don’t forget your PIN code, otherwise the SIM card may be locked and you will need to enter the PUK code or contact your carrier to unlock it.
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