(303) 557-7666
Denver, CO
(303) 557-7666 has 1 FTC complaint and 1 FCC complaint.
Most common complaint: medical and prescription offers (100% of FTC complaints).
- No FTC complaints dated in the 30 days to Nov 13, 2026, 1 in the 90 days before.
- No new complaints since Jul 22, 2026 (FTC data through Nov 13, 2026).
- Only 5 numbers in the 303-557 block have more complaints, of 84 there with FTC complaints.
Complaint history
1 FTC complaint on Jul 22, 2026.
FTC complaints are filed by consumers with the U.S. Federal Trade Commission's Do Not Call registry; they aren't verified by the FTC or by us.
Complaints to the FCC
1 complaint to the U.S. Federal Communications Commission on Jul 22, 2026.
The complainant heard a live person. They filed it as unwanted calls (1). The calls were about health insurance (1). Complainants were in Colorado (1).
Source: FCC Consumer Help Center, Consumer Complaints Data (public domain), complaints about unwanted calls, telemarketing and robocalls. The FCC doesn't verify the facts alleged in complaints, and neither do we.
What callers claimed
Complaint categories chosen by FTC complainants:
- Medical & prescriptions 1 · 100%
Who called
The number's block is assigned to Level 3 Communications, LLC in Denver, CO.
Is it a debt collector?
Nothing says it is: none of its 2 complaints describe debt collection.
Nearby numbers in 303-557
84 numbers in 303-557 have 120 FTC complaints between them (48% robocalls), 1 of them about (303) 557-7666. The commonest categories in the block: Calls pretending to be government, businesses, or family and friends (12%), Medical & prescriptions (11%), Reducing your debt (credit cards, mortgage, student loans) (11%).
The closest reported numbers on either side of (303) 557-7666, in number order.
Location
- Location of the number block
- Denver, CO, USA
- Block assigned to
- Level 3 Communications, LLC
From the North American Numbering Plan Administrator (Nov 3, 2026). This is who the number block was assigned to; numbers can be moved between carriers, and caller IDs can be faked.
The one FTC complainant was in Colorado. Statewide, Colorado ranks #7 of the 50 states and DC for Do Not Call complaints per resident: 59,905 in the last 12 months, 996.3 per 100,000 people. Spam calls in Colorado.
Where FTC complainants were located (U.S. states):
- Colorado 1 · 100%
Complainants' cities:
Longmont, CO (1)
As typed on the FTC form, with spelling variants merged; complaints without a city aren't counted.
Searches on Canadial
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Recent community reports
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What to do
- Don't share personal or banking details, or pay anyone, on a call you didn't expect. Hang up and call the organization back on a number you find yourself.
- Block it from your recent calls (iPhone: ⓘ, then “Block this Caller”; Android: long-press, then “Block”).
- Report fraud to the Canadian Anti-Fraud Centre (1-888-495-8501).
- Report telemarketing if you're registered and still got the call: to the National Do Not Call List.
- A collector calling? How to check a collection agency in your province.
- Report fraud to the FTC.
- Report telemarketing if you're registered and still got the call: to the National Do Not Call Registry.
- A collector calling? See the FTC's guide to your rights.
- Report fraud: in the U.S. to the FTC; in Canada to the Canadian Anti-Fraud Centre (1-888-495-8501).
- Report telemarketing if you're registered and still got the call: in the U.S. to the National Do Not Call Registry; in Canada to the National Do Not Call List.
- A collector calling? In the U.S., see the FTC's guide to your rights; in Canada, how to check a collection agency in your province.
Questions about (303) 557-7666
- Who called me from (303) 557-7666?
- No complaint names the caller. The number is in a block assigned to Level 3 Communications, LLC in Denver, CO (NANPA, Nov 3, 2026); numbers can move between carriers, so the caller's provider may differ.
- Is (303) 557-7666 a scam?
- Canadial rates it low risk, from 2 complaints, latest Jul 22, 2026.
- Is (303) 557-7666 a debt collector or collection agency?
- Nothing says it is: none of its 2 complaints describe debt collection.
- Should I call (303) 557-7666 back?
- Be careful. If you don't recognize it, let it go to voicemail: a legitimate caller will leave a message, and you can reach any real organization on a number you look up yourself.
- How many times has (303) 557-7666 been reported?
- 1 complaint to the U.S. FTC's Do Not Call registry on Jul 22, 2026 and 1 complaint to the U.S. FCC on Jul 22, 2026.
- What do callers from (303) 557-7666 say?
- The most common complaint category is "Medical & prescriptions" (100% of FTC complaints).
Data updated: FTC complaints through Nov 13, 2026; FCC complaints refreshed daily; numbering records as of Nov 3, 2026; community reports live. How this page is built.