SIM800L AT+CPIN="xxxx" return error

Question

When checking the status (AT+CPIN?) of my chip I get the following return:
"SIM PIN required, SIM PUK code required."

And when I try to activate the PIN I get the following error:
AT+CPIN="xxxx"
Error

How can I find out what's wrong?

Answer 1

You got reply "SIM PIN required, SIM PUK code required." You need to enter both PUK and PIN codes.

AT+CPIN="xxxxxxxx","yyyy"

where:

• xxxxxxxx - PUK code
• yyyy - PIN code

Google knows everything: [Hilo] How to manage the PIN code of SIM card? | HL Series FAQ ...