Setting up your Gmail in the default mail app is very handy and easy to do. Just follow the steps below.
- On your iPhone select settings
- Select Mail, Contacts Calendars
- Select Add Account
- Select Gmail
- Enter your username and password
- Your Done
There is also an app for your gmail which is produced by Google which some people prefer if you want to keep your Gmail separate from your normal mail.
You can download the app here.