Although your BlackBerry transmits data over the air very securely, it does not store data on the handheld securely, unless you enable content protection.
To enable content protection, go to Options --> Security and set Content Protection = enabled, which will also require you to enable a password.
When you enable content protection on your BlackBerry, the BlackBerry will encrypt data that it determines to be sensitive, e.g. emails, browser cache, address book entries etc. This prevents someone with physical access to your handheld, from connecting it to a PC and extracting sensitive data. This will give you piece of mind, if your handheld is lost or stolen.
When you lock your handheld, the BlackBerry will start to encrypt data, initially this may take quite some time. While the BlackBerry is encrypting data, an Open Pad Lock icon will be displayed. When the BlackBerry is finished encrypting data, the Pad Lock icon will close.
The BlackBerry will continue to encrypt new data you enter, or receive over the air.
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