Learn how to manage the files and applications in your device, and how to find more information about your device.
If this does not resolve your issue, do one of the following:
Reboot your device. Switch off the device, and remove the battery. After about a minute, replace the battery, and switch on the device.
Update your device 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 device for repair, always back up your device data.