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Phone Directory 312-399 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 399-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-399 Chicago, IL Sprint Spectrum L.p. Cook Cell Number 07/22/1999

Other Series For Prefixes

312-3990###
312-3991###
312-3992###
312-3993###
312-3994###
312-3995###
312-3996###
312-3997###
312-3998###
312-3999###