How to Check Your SKT USIM PUK (SIM Lock Password)

Recently SKT’s unique USIM information was leaked, so I decided to at least do something and lock my SIM.

Though it doesn’t really feel very useful...

I’ll explain based on an iPhone.

1. Setting a SIM lock

 First, go to Settings - Cellular -> SIM PIN.

Then enter your SIM PIN here.

The problem is that if you enter it incorrectly more than three times, the SIM gets locked and it asks you for a password called a PUK.

At that point, your calls and data all stop working.

When that happens, don’t panic and just turn on your laptop.

2. Getting the PUK password

First, go to SK T world.

After logging in, go to MY as shown in the red box.

Then go to My Subscription Information.

There’s a part that can be confusing: don’t click the sub-buttons under My Subscription Information, just click My Subscription Information itself.

If you scroll down, you’ll see the SIM Unlock Code.

Click View.

You can choose any identity verification method.

If you’ve made it this far, your phone is probably unusable, so use your digital certificate for verification.

Now enter the PUK you obtained on your phone, the lock will be released, and you can enter a new SIM PIN.

3. Thoughts on this incident

They say SKT leaked the personal information of 23 million members, so I assume my information has been completely exposed too.

I plan to replace my USIM first thing tomorrow.

And as soon as my contract ends, I’ll switch carriers as well.

One carrier installs viruses on customers’ PCs, another leaks their personal data...

At this point I’m wondering if the only one left is that company using Huawei network equipment.