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Area Code 303
Prefix 303-257
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-257 & All Valid thousand digits
303-257-0xxx
303-257-1xxx
303-257-2xxx
303-257-3xxx
303-257-4xxx
303-257-5xxx
303-257-6xxx
303-257-7xxx
303-257-8xxx
303-257-9xxx