Green Tips 105; Save Energy; Recycle - Nokia 5250 User Manual

Q: Why do I get the error message Expired certificate or Certificate not valid yet
when I am installing a downloaded application?
A: If Expired certificate
should be valid, check that the current date and time in your device are correct. You may
have skipped the setting of date and time when starting the device for the first time,
or the mobile network may have failed to update these settings to your device. To
resolve this, select
Restore the factory settings, and when the device restarts, set the correct date and time.
Green tips

Save energy

You do not need to charge your battery so often if you do the following (if available for
your device):
Close applications and data connections, for example, your Bluetooth connection,
•
when not in use.
Decrease the brightness of the screen.
•
Set your device to enter power saver mode after the minimum period of inactivity,
•
if available in your device.
Deactivate unnecessary sounds, such as key tones.
•

Recycle

All materials of this device can be recovered as materials and energy. For information
on how to recycle your old Nokia products, go to www.nokia.com/werecycle, or using
a mobile device, www.nokia.mobi/werecycle.
Recycle packaging and user guides at your local recycling scheme.
For more information on the environmental attributes of your device, go to
www.nokia.com/ecodeclaration.
or Certificate not valid yet
Menu Settings
>
is displayed, even if the certificate
and Phone Phone mgmt.
>

Green tips 105

Factory settings.
>