area code
US /ˈer.i.ə ˌkoʊd/
UK /ˈer.i.ə ˌkoʊd/
1.
a three-digit number that identifies a specific geographic region in the North American Numbering Plan, used before the local telephone number when making a call to that region
:
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Please dial the area code before the seven-digit number.
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What's the area code for Los Angeles?