Nokia 20 用户手册

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If you do not get an 

OK

 response, refer to section ”Troubleshooting”.

To enter the PIN code, type 

at+cpin="PIN" 

where PIN is your PIN code. Press ENTER. See ”Figure 

2. HyperTerminal connection” for details. 
If entering the PIN code fails three times successively, the code is blocked. Refer to section 
”Troubleshooting”.

To protect your SIM card against unauthorised use, it is good to change the factory setting PIN code 
supplied by your service provider. 

The PIN code can be 4 to 8 digits long. To change the PIN code, enter the following AT command in the 
HyperTerminal connection window: 

at+cpwd="sc","OLDPIN","NEWPIN" 

where OLDPIN is the 

old PIN code and NEWPIN the new code. Press ENTER. See ”Figure 2. HyperTerminal connection” for 
details.