Step 4: Choose Gmail and under Gmail Account Information, enter your prefered name for the email. You also have to enter your email address, which is your Gmail address, password (for your Gmail) and a description. This description will allow you to distinguish each of your emails configured on your iPhone. And click Next.
Step 5: Under Outgoing Mail Server, type "smtp.gmail.com" excluding the quotes.
Note: If you click on Advanced, you can set this email to store your Notes (iPhone Notes application) and Calendar as well.
Step 6: Click on you Mail application on iPhone and you can see the emails configured and can access your Gmail from here.