There is nothing communicated between the characters that necessitates visuals. If the best application of videophone technology you can think of is proving that helicopters exist, there probably isn't a pressing need for the technology.
Vision (Clip 1, 1993)
Connections: AT&T's Vision of the Future (1993)
Writer and Producer of Connections: AT&T's Vision of the Future
The Road Ahead: Future Homes (1995)
Apple's Grey Flannel Navigator (1988)
Apple's Knowledge Navigator (1987)
AT&T "You Will" (1993)