How to know PUK code of iPhone 12 Pro Max?

the puk code has nothing to do with the phone and everything to do with the sim card

How to Determine Your Mobile PUK Code: 7 Steps (with Pictures) (wikihow.com)

if you do not have the code then only options are

1. get it from the carrier as they provide the sim card
2. get another subscription and sim card for the phone

Ask your carrier for PUK code.

What is iPhone 11 puk code

Customer service is closed. My 5 year old hid my phone and put wrong P.C. In to many times and now I need a PUK#

PUK code