There was a time when 4000 was a LOUSY number! Pulse-dial days! That's why ending in '1' caught on. And old habits are hard to change. Which explains why it took a decade or so AFTER DTMF was widely deployed, before any old number was considered suitable. And people started trying to spell their company name, or product, or whatever.
And I still get a laugh when the grandkids bring a new friend in the house that needs to 'check in with home'. I direct them to the rotary dial Trimline in the kitchen and the grandkids spend 5 minutes explaining how to use it.
John C.
