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Area Code 640
Prefix 640-837
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 640-837 & All Valid thousand digits
640-837-0xxx
640-837-1xxx
640-837-2xxx
640-837-3xxx
640-837-4xxx
640-837-5xxx
640-837-6xxx
640-837-7xxx
640-837-8xxx
640-837-9xxx