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Can't register SIM card on GSM Module (SIM800)

Arduino_Uno GSM sim800

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I am using the following quickstart guide: https://www.ayomaonline.com/programming/quickstart-sim800-sim800l-with-arduino

I have tried different sim cards (confirming that they work by testing them in a mobile phone) but I cannot get them to register on the SIM800 module.

This is the module that I am using: https://www.aliexpress.com/item/SIM800L-V2-0-5V-Wireless-GSM-GPRS-MODULE-Quad-Band-W-Antenna-Cable-Cap/32877115526.html

The following are the AT commands and outputs:
AT+COPS=?
+COPS: (3,"VODAFONE","voda NZ","53001"),,(0-4),(0-2)
OK

AT+CFUN?
+CFUN: 1
OK

AT+CREG?
+CREG: 0,0
OK

I have checked the power supply and and that the SIM is plugged in correctly. Any other ideas?

Thanks

I've seen a video where you need to put the sim card into an old phone to unlock it first. Video link included. Might be what you're after.

Hi, thanks for the suggestion. I had already activated the SIM on an old phone. I have also checked that there is no lock on it.