[drdaeman]

Interesting. I'm not an security expert, but believe locking SIM card with a PIN code is a reasonably good idea to ensure in case of a stolen smartphone (non-targeted) it would be more likely thrown out as useless rather than used for any nefarious purposes.

Or I'm wrong?

[ryanlol]

SIM card PINs are not discussed in the article. Instead they recommend asking your telcos support rep to attach a note to your account to prevent sim swapping, which doesn't work.