The best way to integrate an iCal calendar, such as a Google calendar, into Outlook on an iPhone or iPad is to use the browser interface. You can find instructions on how to do this here: Add iCal (Google) calendar to Outlook - Browser
The best way to integrate an iCal calendar, such as a Google calendar, into Outlook on an iPhone or iPad is to use the browser interface. You can find instructions on how to do this here: Add iCal (Google) calendar to Outlook - Browser