Add to Device
I’m building a mobile version of a web application for a client. When people arrive at the log-in screen on an iPhone they see a message that helps them add the site to their device via iPhone’s built-in functionality for bookmarking websites with icons.
I'm actually studying this concept overall because it relies on the functionality of a device which can change. For example, in previous versions of iOS one would tap a plus sign (+) for adding a site to the home screen. Now it relies on an action icon. So this is a concept that would need moderation to ensure the instructions make sense if/when the OS changes.
But for this first version I think it's a pretty solid solution. It also hides after 15 seconds and is remembered via sessions if it is closed manually.