The Apple iPhone comes with a native calendar app that you can link to your Google Calendar without having to download an additional app or synchronization software. Google uses the Internet open standard CalDAV protocol for linking the iPhone calendar with its own calendar service, and you can set this up in the Settings application on your iPhone. After linking your iPhone with Google Calendar, all meeting invites and appointments on your Google Calendar will also display on the iPhone. The system keeps the two calendars synchronized so you can create and view meeting invites and appointments from anywhere. Tips Warnings Writer Bio

How to Add Google Calendar Invites to an iPhone Native Calendar - 92