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Area Code 303
Prefix 303-310
Thousand digits
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Example: 555-555-5555
Area Code and Prefix 303-310 & All Valid thousand digits
303-310-0xxx
303-310-1xxx
303-310-2xxx
303-310-3xxx
303-310-4xxx
303-310-5xxx
303-310-6xxx
303-310-7xxx
303-310-8xxx
303-310-9xxx