By locking the screen, you can help prevent your BlackBerry device from sending accidental messages or pocket dialing. Locking the screen doesn't disable notifications for incoming calls or messages.
Looking for a simple way to help protect your BlackBerry device data and prevent unauthorized use of your device? You can set a device password so that you can lock your device when it's in open view or not in use.
Your device might be network locked which allows your device to make a mobile network connection with only your current service provider. If you plan to travel internationally and you want to use a micro SIM card from another service provider, you might need to enter an unlock code.