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Area Code 406
Prefix 406-856
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 406-856 & All Valid thousand digits
406-856-0xxx
406-856-1xxx
406-856-2xxx
406-856-3xxx
406-856-4xxx
406-856-5xxx
406-856-6xxx
406-856-7xxx
406-856-8xxx
406-856-9xxx