As a very tiny example of the impact of changing a phone number. At work we are consolidating two billing offices into one.
The budget for the secondary impacts of updating every instance where we tell customers about the closing office address/phone is $38,000 (it would be the same if just the phone number were changing). Admittedly, there are economies of scale (it would cost only a little bit more to do two office similar office closures), but you can see why we're much happier with 10-digit dialing than lengthening the base number.
(I know that this is just reiterating what I said befoer and GD said before that, but I just realized it was a great example and I was dealing with it today.)
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