|General Information for Area Code 312|
|Time Zone||Central (UTC-06:00)|
|Prefix||Primary City||County||Phone Type|
|312-555||Chicago, IL||Used in movie||Cell Number|
Area code is a type of numbering scheme used in telecommunication. It divides the territories of its member countries, the code is a three-digit code. The digits 0 and 1 applied for central office codes. Other digits were applied into geographic areas of the service territory.
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