Mobile Help Center

Why do I get a security / certificate error when I access Google Calendar from my mobile browser?
Some phones display an "Invalid certificate" or "Could not verify domain" message when attempting to connect to Google Calendar. This may mean that your phone doesn't meet the minimum requirements needed to access Google Calendar for mobile browser. For Treo 600 users, if you receive an error that says "Invalid certificate (unknown error). Display this page anyway?” click "OK" to continue. You'll then be able to access Google Calendar. This error occurs because the Treo 600 doesn't recognize newer security certificates used by Google Calendar for mobile. If you’re using a Sprint Sanyo phone and you receive a message that says "Exit from SSL mode", click "OK" to continue. You'll then be able to access Google Calendar for mobile.