Even though it never really took off (at least in Europe), I find SMS as a bearer medium for the WAP 1.0 stack fascinating.
One of my first PDAs could do something similar for sharing files as a series of concatenated binary SMS over an Infrared connection via a mobile phone.
The only problem was that SMS was paid per message in my country (double-digit cents each). Fortunately the preview dialog showed the estimated number of messages before sending – and it was something like 1000 for a small JPEG…