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Phone Directory 406-866 Detail

State Major City Time Zone
Montana Billings Mountain

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Example: (406) 866-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
406-866 Great Falls, MT Qwest Corporation Cascade Landline 02/04/1994

Other Series For Prefixes

406-8660###
406-8661###
406-8662###
406-8663###
406-8664###
406-8665###
406-8666###
406-8667###
406-8668###
406-8669###