Zte A139+ User Manual page 44

SIM card, you need to select the network provider again by choosing Automatic or
Manual.
You can set preferred networks and add new ones or change priority.
The GPRS Connection can be set to When Needed or Always.
Security setup
SIM Lock: The SIM password (PIN code) can prevent your SIM card from illegal
use. Select ON/OFF to enable or disable the SIM password protection.
Note: Three consecutive incorrect PIN code entries will lock the SIM card. Then,
the PUK code is needed to unlock the SIM card. The PIN code and the PUK code
may be provided to you together with the SIM card. If not, please contact with your
network service provider. Please change it with your own private password as soon
as possible.
Phone lock: Phone lock can prevent your mobile phone from unauthorized use.
Select ON/OFF to enable or disable the handset lock protection;
Note: The default Phone lock code is 1122.
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