If you want to change the email sync time and frequency for receiving emails on your apple iphone 6 it can be a great battery saver. First go into the settings and scroll down to mail. Once in there click fetch new data. From in here the top option push new data should be highlighted. This means that your iphone 6 is constantly checking for new emails coming in. If you turn this option off and go to the bottom and change to fetch you can put receiving emails on a 15, 30, and 1 hour time schedule. You can also put it on manual if you don’t need to check for emails too much. If your an important person and need the push feature you can leave it, however using the fetch feature to schedule email syncing is a good way to save some battery life.