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Exchange · Denver, CO

(303) 778-xxxx

Every number from 303-778-0000 to 303-778-9999. NANPA records the exchange as assigned to Lumen (CenturyLink) for Denver, CO. Robocall and scam operations often use many numbers from one exchange, so if one number here is a shady call, its neighbors deserve a second look.

CarrierLumen (CenturyLink)original
Line typeLandlinelikely
Rate centerDenver, CO
Flagged numbers1

Reported numbers starting 303-778

NumberVerdictWhat it isReportsComplaints
(303) 778-1000CautionTelemarketer / sales05

About the 303-778 exchange

303-778 is an exchange (the first six digits of a phone number) in area code 303, which covers Colorado. NANPA, which runs the North American Numbering Plan, assigned it to Lumen (CenturyLink) for the Denver, CO rate center. Numbers from this carrier are usually landline lines.

People keep their number when they move or switch carrier, so this is where the number was first assigned, not where the caller is today. Local time for 303-778 numbers is usually Mountain time. Scammers can also fake (spoof) any number, so a call that shows a 303-778 number may not come from Lumen (CenturyLink) at all.

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