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Area Code 303
Prefix 303-528
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-528 & All Valid thousand digits
303-528-0xxx
303-528-1xxx
303-528-2xxx
303-528-3xxx
303-528-4xxx
303-528-5xxx
303-528-6xxx
303-528-7xxx
303-528-8xxx
303-528-9xxx