Call log
This tab displays the history of all of your calls. From here you
can call or contact any of the entries. To delete an entry, touch
and hold the entry and then touch Remove from call log in the Context menu that appears, then touch OK. To delete your Call log, touch the Menu Key 
> 
> OK.
[Note]
You can also selectively delete entries from the Call log.
Touch the Menu Key > Clear 
> touch the checkboxes to the left of the entries
to delete > Delete > OK.