Whilst area codes certainly aren’t as important today as they used to be – primarily due to the proliferation of mobile phones – area codes used to be a point of prestige. Area Code Day remembers a bygone era when the evolution of telephone networks meant changing numbers, changing boundary definitions, and how much your area code could affect the perception and culture of your neighbourhood.
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All details taken directly from provider content at http://www.daysoftheyear.com/days/area-code-day/