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Area Code 303
Prefix 303-400
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-400 & All Valid thousand digits
303-400-0xxx
303-400-1xxx
303-400-2xxx
303-400-3xxx
303-400-4xxx
303-400-5xxx
303-400-6xxx
303-400-7xxx
303-400-8xxx
303-400-9xxx