How to start a Blackberry in Safe Mode
There are times some third party applications starting automatically can cause havoc on your Blackberry device. If you are using a device with OS 4.6 or higher, you are in luck. You can simply start the device in safe mode, similar to Windows. This disables the automatically starting apps and allow you to troubleshoot.
The steps are really simple.
1. Remove and reinsert battery.
2. Wait for the red light go off.
3. As soon as red light is off, press and hold Escape key as the OS continues to load.
4. Shortly you´ll see a dialog box stating you are in safe mode, click OK to continue.
And to exit, you can simply reset the phone again.
See the details at Blackberry KB Article 17877.