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One of the headline-garnering features of the S4's new software offerings are the 'touchless' operations such as AirView.
AirView lets you preview the content of an email or text message without opening it or touching the handset.
To use AirView you simply open the messages or email inbox and point at the message you want to preview and it will display it on screen.
The image above shows a preview of an email without needing to open or tap it to view the contents. If you hover your finger over any email attachments it will tell you what kind of attachment it is, for example, an image or document.