How to Set Up SIM Card Lock on Android and iPhone?

People don't bother with the SIM Card Lock in their phones, but it carries significant weight. You can set up a screen lock easily, but you may need to realize that there is another extra layer of security you can add, i.e., the SIM Card Lock, to secure your phone number. In this blog, I will discuss what SIM card lock is, how to set up a SIM card lock on Android and iPhone, and the pros and cons of setting up a SIM card lock on your phone.
SIM Card Lock is a PIN that requires a lock screen PIN, Pattern, Fingerprint or Password, and a SIM Card to be active before you can unlock the phone. It is a physical two-factor authorization that disallows hackers from tracking or misusing your SIM Card.
Usually, a SIM comes with a default PIN code directly from your mobile carrier. These codes vary company by company. Here is the list of the defalut PIN code of some of the popular mobile carriers:
1. Default SIM Pin code of Sprint and T-Mobile is 1234.
2. Default SIM Pin code of AT&T and Verizon is 1111.
You can either Google these codes or call your carrier support and ask for the codes.
Here is how to do the SIM card lock on your Android phone.
Here is how to do the SIM card lock on your iPhone.
Watch this video for more information:
Wait to turn the SIM lock on. When you turn on the SIM lock, you will be asked for a SIM PIN. If this is the first time turning it on, it will ask you for a 4-digit default passcode and warn you that you usually have three attempts to get it right, or it will lock your SIM up. I'll give you instructions at the end later in the blog. I want to warn you before we take the next step.
Each operator has a default passcode, usually 1111, 0000, or 1234. I googled this for AT&T and Verizon, and both said 1111, so on my phone, I used 1111, and it worked both times. Now, if the SIM was locked previously and then unlocked using a PUK code, then the default PIN will change to 0000 for Verizon. So keep that in mind if your SIM was locked previously and google your carrier's default PIN after a PUK unlock.
If you make two attempts and fail, then bail out of the PIN lock feature and contact your provider before that 3rd attempt, or you won't be able to use your cell phone to contact them.
So let's move forward and turn on the SIM lock. Enter the default 4-digit passcode, which will confirm the lock is correct. You can now change the SIM pin. Otherwise, the SIM lock has no value, as a hacker would enter the default passcodes to try and access it.
Once you change your SIM lock PIN, you're now set, and if someone gets a hold of your device and removes the SIM, it will not be usable on another device. This SIM PIN differs from the PIN you would enter to unlock your phone, so choose a lock number you will remember.
Now, if you ever forget your SIM lock code, you can still unlock it with a PUK code, a PIN Unlock Key different for every SIM card. Sometimes You can find the PUK on the original SIM card if you still have the business card-sized piece of plastic, or you can call your service provider and request the PUK, which can take some time for them to provide, but when you get the PUK you can unlock your SIM and start over.
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Again, the SIM card lock only helps when someone has physical access to your device. One of the fastest-growing threats to your mobile is an actual SIM swap which can be done remotely by hackers who impersonate you, bribe a carrier employee, or plant their people within a carrier or 3rd party store employee. If you want to secure yourself against SIM swaps and SIM swap losses, check out the secure mobile SAFE plan at efani.com where your account is protected from SIM swaps and the release of your PUK to nefarious people.