When you want to learn more about how to use your product or you are unsure how your phone should function, read the user guide thoroughly.
You may also be interested in the Nokia Support Video channel in YouTube.
If this does not resolve your issue, do one of the following:
Reboot your phone. Switch off the phone, and remove the battery. After about a minute, replace the battery, and switch on the phone.
Update your phone software
Restore the original factory settings
If your issue remains unsolved, contact Nokia for repair options. Go to www.nokia.com/repair. Before sending your phone for repair, always back up your data, as all personal data in your phone may be deleted.