Hi,
Back in the mid to late 80's I used to see all of these IBM tech's
on the city buses and in the streets with these handheld devices, they
were standard IBM off-white with a small keyboard on them, the size of
a footprint of a VHS cassette, but about 1.5 times as thick...
They were using them to send and receive text messages to the
service center and to one another (Pre-cursor to AOL IM'ing I suppose...)
This was in New York City, I'm assuming it must've been either
across an early text message pager type network or a nascent cellular
setup that IBM established for its service techs...
IBM PCradio?