(Cheap) SMS was compared to (expensive per-minute) calling, as an example of a technology that caught on even though its use wasn't easy. (The phone keypad bein

(Cheap) SMS was compared to (expensive per-minute) calling, as an example of a technology that caught on even though its use wasn't easy. (The phone keypad being unwieldy for typing long messages because every 3 letters is grouped with a single number)