That might have been true 20 years ago, but today with the 7 digit numbers running out, they've had to create new area codes to accommodate the demand.
This is why Massachusetts has so many area codes and all of local. The Boston area alone as 617 and 857, that's not for long distance charges but unique numbers
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Thanks for reading my first two sentences.
And for the others who responded to me, I don't disagree. But maybe you should read what I responded to, for context.