Around 1952 the price of a call from a pay phone increased from 5 cents to 10 cents in New York City. In those years many classic nickel products, such as a cup of coffee or a subway ride, already jumped from a nickel to a dime. (After WW II there was substantial inflation).
I was wondering if this increased was applied to the entire Bell System all at roughly the same time, or was gradually phased in in different places at different places. (Obviously some phase-in time was required in order to convert the pay phones to count up two nickels or one dime.)
Any info on pay phones of that era would be appreciated.
Thanks![public replies please]