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2009 Samsung S9110
This is one of the slightly more unusual smart devices - a watch that was also a phone. This Samsung S9110 from 2009 was at the time touted as the world's thinnest watchphone, sporting a 1.76-inch touchscreen, Bluetooth, email support and MP3 playback.
The 12mm thick device also supported voice recognition and speakerphone and had a 40MB internal memory.