Nokia 5228 - Manual (Page 114)

Q: How do I calibrate the screen?
A: The screen is calibrated at the factory. If it is necessary to recalibrate the screen,
select Menu > Settings and Phone > Touch input > Touch screen
calibration. Follow the instructions.
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 or Certificate not valid yet is displayed, even if the
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 Menu > Settings and Phone > Phone
mgmt. > Factory settings. Restore the factory settings, and when the device
restarts, set the correct date and time.
20. Protect the environment
Save energy
You do not need to charge your battery so often if you do the following:
● Close applications and data connections, for example, your Bluetooth
connection, when not in use.
● Deactivate unnecessary sounds, such as touch screen and key tones.
Recycle
When this device has reached the end of its working life, all of its
materials can be recovered as materials and energy. To guarantee the
correct disposal and reuse, Nokia co-operates with its partners through
a program called We:recycle. For information on how to recycle your
old Nokia products and where to find collection sites, go to
www.nokia.com/werecycle, or using a mobile device, nokia.mobi/
werecycle, or call the Nokia Contact Center.
Protect the environment
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