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Area Code 406
Prefix 406-639
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 406-639 & All Valid thousand digits
406-639-0xxx
406-639-1xxx
406-639-2xxx
406-639-3xxx
406-639-4xxx
406-639-5xxx
406-639-6xxx
406-639-7xxx
406-639-8xxx
406-639-9xxx