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Area Code 303
Prefix 303-520
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-520 & All Valid thousand digits
303-520-0xxx
303-520-1xxx
303-520-2xxx
303-520-3xxx
303-520-4xxx
303-520-5xxx
303-520-6xxx
303-520-7xxx
303-520-8xxx
303-520-9xxx