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The three digits following the area code represent the 'exchange' or the 'prefix.'
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoA phone number in the US has an area code, exchange, then the personal 4-digit number.
So the second set is the exchange, also often referred to as the prefix.
Wiki User
∙ 11y agoThe next three digits after the area code are often called the prefix or the exchange.
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