Zte R3000 User Manual page 46

SIM security
The personal identification number (PIN) for your SIM helps avoid its misuse.
You need to enter the SIM's PIN when your new phone is first turned on.
Otherwise the phone can only make emergency calls.

For a new card, the default PIN is supplied by your network service
provider.

To enable/disable the PIN From idle mode, select Main menu >
Settings > Security settings > Phone and SIM > PIN lock.

To change the PIN code from idle mode, select Main menu >
Settings > Security settings > Phone and SIM > Change
PIN/PIN2.
Note:
If you change the PIN, please remember the new number.
PIN2 is needed for some settings. Use the same procedure as for the PIN.
Phone security
A password can protect your phone and help avoid misuse. If your phone is
password-protected, you will have to enter the correct password when the
phone is turned on.
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