Gmail is a free email service provided by Google. Using an application on your phone, you can retrieve and send Gmail messages. Follow these instructions to retrieve and send Gmail messages. You need to set up your phone for internet to use this function. Click here for more information.
You also need to activate a Google account. Click here for more information.
If you don't want to use Gmail using an application on your phone, you can use your phone's browser: open the browser and connect to http://gmail.com.