How to resolve Most BlackBerry device problems?
Simple & easy way: Take the battery out while the BlackBerry is ON, wait for 2 seconds, put the battery back on. BlackBerry will turn on by itself and that’s it !! 
Your device problem is resolved. Most BlackBerry device problems can be resolved by this way. This process is also known as hard reset, power cycle or battery pull.
Short-cut: On full QWERTY keyboard BlackBerry device like Curve, Bold, 88xx series – Press and Hold ALT, Right Shift and Del Key
Third Party App:
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Download Free QuickPull app from BlackBerry Mobihand site and it will do with a click of a trackball. You can also schedule QuickPull and it will just do it at that time.
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Just came across KB article KB02794 on a BlackBerry site which indicates the Reasons to perform a hard reset on a BlackBerry smartphone