Safe Mode puts your phone in a diagnostic state (returned to default settings) so you can determine if a third-party app is causing your device to freeze, reset or run slow.
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Navigate to the BlackBerry article KB17877.
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Follow the instructions provided for: How to start a BlackBerry smartphone in safe mode.
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While in Safe Mode, remove the most recently installed apps.
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Power cycle the device then attempt to use the device.
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If the device works properly, install apps one at a time to identify the app causing the problem.