Q: Why do I get the error message Expired certificate or Certificatenot valid yet when I am installing a downloaded application?A: If Expired certificate or Certificate not valid yet is displayed, even if thecertificate should be valid, check that the current date and time in your device arecorrect. You may have skipped the setting of date and time when starting the devicefor the first time, or the mobile network may have failed to update these settingsto your device. To resolve this, select Menu > Settings and Phone > Phonemgmt. > Factory settings. Restore the factory settings, and when the devicerestarts, set the correct date and time.23. Protect the environmentSave energyYou do not need to charge your battery so often if you do the following:● Close applications and data connections, for example, your Bluetoothconnection, when not in use.● Deactivate unnecessary sounds, such as touch screen and key tones.RecycleWhen this device has reached the end of its working life, all of itsmaterials can be recovered as materials and energy. To guarantee thecorrect disposal and reuse, Nokia co-operates with its partners througha program called We:recycle. For information on how to recycle yourold Nokia products and where to find collection sites, go towww.nokia.com/werecycle, or using a mobile device, nokia.mobi/werecycle, or call the Nokia Contact Center.Recycle packaging and user guides at your local recycling scheme.The crossed-out wheeled-bin symbol on your product, battery, literature, orpackaging reminds you that all electrical and electronic products, batteries,Protect the environment© 2010 Nokia. All rights reserved. 145
