We've built an add-on that takes care of synchronizing your Cobot booking calendar with Google Calendar. It's called Google Calendar Sync.
We offer so called iCal feeds which you can subscribe to with calendar apps such as the one on your phone or computer.
First you need the URL of the booking calendar feed. You can find it by clicking on the calendar icon in the headline of the booking calendar. In the popup that opens copy the URL to the clipboard. Then go to your app to subscribe to the feed from there.