That's not really possible, isn't?
but you can fit 4.3'' in a an iPhone 5s-sized body and they don't need to do anything just stretch the display a little bit lol
http://www.raqwe.com/wp-content/upl...-4-3-inch-screen-ios-7-video-raqwe.com-01.jpg
Oh it's possible, just need to get rid of those pesky bezels.