How third parties generate valid pins for locked to the network devices

[m0nix]

Originally Posted by chants

I imagine SIM card locks are not that strong. And this is really a silly point. Obviously if a phone is stolen, the SIM card is thrown away as its a perfect tracing/tracking device. So there is little benefit to trying to break in through it.

This security in context is just to prevent someone who happens on your phone from using it in a short term context. 4 digits but locked after 3 tries which I would hope is in hardware. The 8 digit PUK code would be easily brute forcible with the right hardware.

More interesting is when wifi routers have a default network name which is tied to the default password which typically is never changed.

To clarify i do not talk about the SIM card itself, the lock consist on the device itself, on hardware level strongly connected with low level software on the chip, like the bootloader or emergency download mode.