I believe the reason for this is so that when pulse-dialling, all the other numbers keep the correct value, i.e.: 1 = 1 pulse 2 = 2 pulses ... 0 = 10 pulses O

I believe the reason for this is so that when pulse-dialling, all the other numbers keep the correct value, i.e.: 1 = 1 pulse 2 = 2 pulses ... 0 = 10 pulses Or else they'd all be offset by one