Are you losing call logs and text messages? Or did you just get a new BB device but are unsure how to best set it up? Maybe you are upgrading your OS and want to have a nice clean installation. The setup wizard removes a few things but not all that should be removed. Many of you have asked me what I do to free up memory on my devices and prevent loss of emails and call logs, etc.  You may want to setup your device slightly different but this is a good starting point.

Complete Tutorial from blackberryforums.com