Tap "Settings" on the iPhone "Home" screen

• Make sure you have no other Exchange account set up on your iPhone that you intend to keep.
  • Push Gmail will replace any existing Exchange account, whose mail, contacts and calendar will not longer synchronize with iPhone Mail, Contacts and Calendar.
• Tap Settings on the iPhone Home screen.

Go to "Mail, Contacts, Calendars"

• Go to Mail, Contacts, Calendars.

Tap "Add Account..." under "Accounts"

• Tap Add Account... under Accounts.

Choose "Microsoft Exchange"

• Choose Microsoft Exchange.

Enter your Gmail address under "Email"

• Enter your Gmail address ("example@gmail.com", for example) under Email.
• Tap "m.google.com" (not including the quotation marks) under Domain.
• Now tap your full Gmail address under Username.

Enter your Google Calendar password under "Password"

• Enter your Google Calendar password under Password.
• Optionally, tap "Gmail" under Description.
• Tap Next.

Choose "Accept" if the iPhone is unable to verify the "gmail.com" certificate

• Choose Accept if the iPhone is unable to verify the "gmail.com" certificate.

• Enter "m.google.com" under Server.
• Tap Next again.

• Make sure Mail is ON.
• Turn ONCalendars if you want iPhone Calendar to sync with Google Calendar; note that iPhone Calendar can synchronize only with one calendar source, and Google Calendar will replace an existing MobileMe or, iCal or Exchange calendar.
• Turn ONContacts only if you have copied your existing contacts to Gmail. Otherwise, your existing iPhone address book will be replaced with your Gmail contacts.

• Tap Done.