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Area Code 406
Prefix 406-840
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 406-840 & All Valid thousand digits
406-840-0xxx
406-840-1xxx
406-840-2xxx
406-840-3xxx
406-840-4xxx
406-840-5xxx
406-840-6xxx
406-840-7xxx
406-840-8xxx
406-840-9xxx