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Area Code 406
Prefix 406-631
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 406-631 & All Valid thousand digits
406-631-0xxx
406-631-1xxx
406-631-2xxx
406-631-3xxx
406-631-4xxx
406-631-5xxx
406-631-6xxx
406-631-7xxx
406-631-8xxx
406-631-9xxx