How to sync iPhone 4 calendar to Google calendar?

[Booju16]

It only syncs in one direction, google to iphone, but not iphone to google. How does one make it sync in both directions?

 

[DDustiNN]

Go to Settings --> Mail --> Add Account and set up an Exchange account (NOT the Gmail option). Then just use your full Gmail address and password, and m.google.com for the domain, and then it will let you choose to sync Contacts, Mail, and Calendars I believe.

I did this on my iPad and it worked just fine. I added an appointment using the stock Calendar app, then checked the calendar app on my Android phone and the event was added almost instantly.

 

[neko girl]

You could also use CalDAV protocol to sync a Google calendar to your iPhone. This is useful if you have more than one calendar on your Google account. You can set up a CalDAV account for each additional calendar.

Here are Google's instructions for setting this up:
http://www.google.com/support/mobile/bin/answer.py?hl=en&answer=151674