
In the settings menu, tap on “Cellular” located just below the Bluetooth option as shown in the screenshot below.Head over to “Settings” from the home screen of your iPhone.For instance, if you’re on AT&T or Verizon, the default PIN is 1111. The default SIM PIN varies depending on your network provider. How to Set a SIM Pin on iPhone to Lock SIM Cardīefore you get started with the following procedure, you’ll need to find out the default PIN for your SIM card since it’ll be required to enable this feature. Consider this as sort of like two-factor authentication required to access your SIM card.

This can be prevented by using a SIM Lock.

However, the physical SIM card that’s installed on your iPhone can be taken out and accessed by anyone to make phone calls from any other phone. The passcode you use to unlock your iPhone protects all your valuable data stored on the device itself.
