Nokia 6670 - Manual (Page 36)

Nokia 6670 User Guide 35 Copyright © 2005 Nokia
Your phone
Log settings
Select Menu > Log > Options > Settings to open the list of settings.
Log duration—The log events remain in the phone memory for a set number of
days after which they are automatically erased to free memory.
If you select No log, all the log contents, recent calls log, and messaging
delivery reports are permanently deleted.
Show call duration—Set to Yes or No. See "Call timers" on page 34.