A handy guide to setting up Gmail on your iPhone or iPad
There is, of course, a Gmail app for the iPhone and iPad, and it's good. But setting up Gmail in your native mail has many advantages - such as easily managing multiple accounts - and is worth doing. It's also very straightforward to do, just follow these steps.
Open the Settings application on your device's home screen.
Open Mail, Contacts, Calendars.
Press Add Account....
Select Microsoft Exchange.
In the Email field, enter your full Google Account email address.
Leave the Domain field blank.
Enter your full Google Account email address as the Username.
Enter your Google Account password as the Password.
Tap Next at the top of your screen.
Choose Cancel if the Unable to Verify Certificate dialog appears.
When the new Server field appears, enter m.google.com.
Press Next at the top of your screen again.
Select the Google services (Mail, Calendar, and Contacts) you want to sync.
Unless you want to delete all the existing Contacts and Calendars on your phone, select the Keep on my iPhone (or iPad or iPod touch) option when prompted.