On my Nokia 3120 and 2610 I have set it up to 'switch off' if unused for 8
seconds, to conserve the battery.

Annoyingly, they then takes another 15 seconds for the screen to switch off
after that; which just seems uneccessay waste of battery. Is there any
way to set up these phones to reduce this closing down time after the 'auto
shut' operates ? thanks