ternyata menghapus seluruh contact di bb cukup simple, tidak harus wipe device, tips ini hanya untuk bb qwerty

Clear the address book database.

From the BlackBerry smartphone

From the Address Book application, press the Menu key
Select Options and type RSET on the BlackBerry smartphone keyboard
Note: Implemented in BlackBerry Device software 4.2.2, this clears all entries within the Address Book (all records from Contacts). If Address Book is wirelessly enabled for synchronization and the source is reachable, all address book entries will be re-populated back onto the BlackBerry smartphone.