If you're unlucky enough to lose your smartphone or have it stolen, as accidents happen to all of us, it's not only the hardware that could fall into the wrong hands. Anyone who finds the device will also be able to access any content stored on the device, whether its contacts, music or documents. However, by implementing a SIM card PIN lock, everytime the device is powered down and subsequently switch back on again, the PIN will need to entered before the phone can be used or any of its contact accessed.
Here's how to implement a SIM card on a BlackBerry.
From the home screen, select Options.
Open the Advanced Options menu and then select SIM card.
From here, press Enable Security to turn the SIM PIN on. It's worth noting, if this is the first time you've turned the function on, you may be asked to enter the operator's default SIM card PIN. You only have three attempts to enter the pin before the SIM card is locked, after which you'll need to obtain a PUK code from your network to unlock the SIM. If you don't know the default pin, we recommend you obtain it before you attempt this. Now every time the phone is switched on, you'll be required to enter the pin before you can use the handset