 The main advantage of using a dual fronted device is the enhanced ease of use by having distinctive functions for each side.For example, having a mobile phone with a dual front for the camera encourages the user to hold the phone horizontally which reduces the learning curve because the buttons and functions are located in similar places to a common digital camera.The dual front concept began in 2003 when Sony Ericsson started its camera phone range with the T610 and T630 which could be held comfortably in the style of a real digital camera due to its side-mounted shutter button; they also had rear designs which loosely resembled the design of digital cameras.