Zte BLADE - Protecting Your SIM Card with a PIN

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If you make a mistake, your phone will ask you to try again.
Protecting Your SIM Card with a PIN
You can set the PIN password to prevent others from using the
SIM function. The initial PIN code is provided by your service
operator.
1. Tap
> Settings > Location & security > Set up SIM/RUIM
card lock.
2. Select the Lock SIM/RUIM card check box.
3. Enter the PIN and tap OK.
Change SIM PIN
Before changing SIM PIN, you need to enable it.