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Area Code 303
Prefix 303-523
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-523 & All Valid thousand digits
303-523-0xxx
303-523-1xxx
303-523-2xxx
303-523-3xxx
303-523-4xxx
303-523-5xxx
303-523-6xxx
303-523-7xxx
303-523-8xxx
303-523-9xxx