My calander on my phone has lost all the information that was entered but my gmail account calander still has all the date present -how do I sync my phone to the gmail calander so all the information will be on my phone calander again. Thank you Mike
You should be able to go into the settings in the calendar and check the box to sync the google calendar. Or go through the accounts / sync menu for your google account and make sure the calendar is checked to sync.
If you've tried all troubleshooting tips and everything fails, then it's time to "reset" the device. If that doesn't fix the issue - you may need to take the phone to a repair center for a diagnostic test to see if the device is defective.