Blackberry Secret Codes:

Displays your signal strength in decibels, instead of bars. Hold "Alt" and press "N", "M", "L", "L" (repeat to reverse the effect)..
Address Book file verification. Checks the data in your Address Book for inconsistencies. In the Address Book, hold "Alt" and press "V", "A", "L", "D"..
Address Book data structure rebuild. Forces a data structure re-build in the Address Book... In the Address

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