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A telephone area code is numeric data, but in some cases it may be more appropriate to store it as a text field because many countries quote telephone area codes including the trunk prefix 0. For example, Liverpool, England, is in UK area code 0151. Also, it is sometimes more appropriate in countries that have variable-length area codes to sort them lexically, so that 031, 0321, 0322, 0325, and 033 would appear in that order.

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