@Albee
The default SIM card PIN for all Public Mobile SIM cards is 1234. Howeverr, if your phone is asking for the SIM card's PUK, you will need to ask a Public Mobile customer support agent for that.
If your phone is asking for a SIM Netowrk Unlock PIN or a SIM Network Unlock PUK, that isn't actually a code to unlock your SIM card, but rather a code to unlock your phone. In that case, the previous carrier would need to be contaced for the needed code/codes.
