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Area Code 406
Prefix 406-340
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 406-340 & All Valid thousand digits
406-340-0xxx
406-340-1xxx
406-340-2xxx
406-340-3xxx
406-340-4xxx
406-340-5xxx
406-340-6xxx
406-340-7xxx
406-340-8xxx
406-340-9xxx