Open the mail application on your device and add an account.
Add it as an Exchange account rather than POP3 or IMAP.
Your email address is firstname.lastname@example.org, not your google pilot address, and your password is your gmail password.
When asked for your username it is your full email address - email@example.com. The Exchange server is m.google.com.
Android and Windows Mobile Users - You will need to make sure the account is set to "Use secure connection (SSL)" and "Accept all SSL certificates"
If you want contacts, don't use on IPHONE the Google mail option
If you use just the google option when you add an account, you won't get any contacts!
So follow the IMAP option... more info on this link: