After restoring previously backed-up data to your BlackBerry 9700 smartphone, new Short Message Service (SMS) messages that are received appear as coming from the mobile number instead of the actual name of the contact.
Resolution:
Upgrade the BlackBerry Device Software to version 5.0.0.388 or later. For information on how to perform an upgrade of the BlackBerry Device Software, see KB03901
Note: BlackBerry Device Software is specific to the wireless service provider your BlackBerry smartphone was sold from. The availability of the BlackBerry Device Software is dependent on the release of BlackBerry Device Software by Research In Motion and the acceptance of that build by the wireless service provider.
To confirm this BlackBerry Device Software is available, view the software download site:
http://na.blackberry.com/eng/support/downloads/download_sites.jsp