More details would be helpful @potzilla420
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“SIM network PIN blocked. Enter SIM network PUK." is asking for the phone’s (often Samsung) “master code" after entering the wrong code too many times. Samsung and/or your previous carrier can give you this.
"SIM network unlock PIN" is asking for your previous carrier's unlock code - just contact them with your IMEI (dial *#06# to get it) and they'll give it to you. If you enter this incorrectly too many times, you'll get the error message above.
“PIN unlock key (PUK)” is a SIM-specific code used to prevent unauthorised use of a SIM card.
The PIN (Personal Identification Number) enables secure access to the SIM card and network. It is provided with your SIM card.