When Touch Tone dialing was introduced, the Bell System came out with newly designed desk and wall telephone sets to accomodate the keypad.
The desk set (dial 500, TT 1500/2500) became fatter and higher to accomodate the tone pad. However, the wall set (dial 554, TT
1554/2554) became slimmer.
So, I was wondering why the desk set became bigger while the wall set became smaller to accomodate Touch Tone? Anybody know?
[public replies, please]
P.S. While we're on the subject, would anyone know what percentage of lines are still served by exclusively dial equipment? I don't think they charge a premium for TT anymore. Also, many people have some old rotary sets still in service (like me) even if their primary sets are TT.
Thanks!