SIM PIN code iPhone error?

Hello. Can anyone tell me what could have happened? Before restarting my iPhone, I briefly went to "Change PIN (SIM)." Then I entered the correct PIN code to log in. (Go to Settings to change it.)

I then canceled the process without setting a new PIN or entering any number, and I exited this setting. Then I restarted my device, and the iPhone told me "incorrect PIN."

What might have happened? Does anyone with technical knowledge have an explanation?

Of course I had to unlock it with PUK.
Nevertheless, I would like to know why the iPhone suddenly starts acting up

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archibaldesel
5 months ago

In 99.99% of all errors the problem is before the keyboard.

apfelbus
5 months ago
Reply to  archibaldesel

Yup. Error 40.

Curasanus
5 months ago

Without entering, repeating and securing a new PIN, the old / previous PIN continues to apply.

Curasanus
5 months ago

Each card has its own PIN and PUK,