The phone's redial operation works in one of the following modes:
Open Call Log – In this mode, pressing Redial displays a list of your most recent outgoing calls. You can select the call that you want to redial from the list.
Last Dialled – In this mode, pressing Redial immediately repeats your most recent outgoing call.
In either case, the redial function uses the outgoing call records in your personal call log. If you delete the records in your call log (see Deleting the Whole Call Log), redial will not work until new outgoing call records exist.