Taking inspiration from wrist-worn communicators featured in sci-fi movies, the Samsung SPH-WP10 was unveiled in March 1999, touting it as the world's first CDMA watch phone. At the time ...

But there's a real novelty factor in being able to flick a phone against your arm and watch it curl around your wrist, just like the slap bracelets of my childhood. As with other foldable phones ...

This enables the device to monitor the user’s heart rate and other health metrics when worn as a watch ... a phone that doubles up as a phone and a smartwatch when wrapped around the wrist.