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Area Code 423
Prefix 423-840
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 423-840 & All Valid thousand digits
423-840-0xxx
423-840-1xxx
423-840-2xxx
423-840-3xxx
423-840-4xxx
423-840-5xxx
423-840-6xxx
423-840-7xxx
423-840-8xxx
423-840-9xxx