Samsung is set to launch adevice in its flagship premium smartphone range, expected to be named the Galaxy S4.

It follows the S3, a handset that has sold more than 40 million units. The Galaxy handsets are seen as the closest competitor to Apple's iPhone. Analysts predict software that tracks where users are lookingand automatically scrolls down the page as it is read, without it being touched. There is also expected to be a souped-up camera and processor. But crucial to Samsung's futuresuccess, analysts say, is how the South Korean company plans to turn its strong position in the smartphone market into greater success with other devices such as tablets. Prior to Thursday's launch in New York, Samsung has unleashed a huge advertising campaign, including a series of videos involving a small boy tasked with looking after a"top secret" box