How to Abbreviate a Phone Extension | Bizfluent
Sep 26, 2017 · Use hyphens to separate the area code, local prefix and four-digit line number. For example: XXX-XXX-XXXX, where the Xs stand in for the numbers. Type a comma, followed by a space, after the phone number. Type "ext." followed by a space and then the extension number. For example: XXX-XXX-XXXX, ext. 766.
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