(303) 381-3633
Denver, CO
(303) 381-3633 is likely an unwanted sales call: 4 FTC complaints, 0% recorded messages, most often about computer and tech support (25%).
- No new complaints since Jun 23, 2023 (FTC data through Nov 13, 2026).
- More FTC complaints than 98% of the 26,440 numbers with FTC complaints in area code 303.
- Only 3 numbers in the 303-381 block have more complaints, of 210 there with FTC complaints.
Complaint history
4 FTC complaints between Jan 18, 2023 and Jun 23, 2023.
The FTC complaints came in 2 of the 6 months from Jan 2023 to Jun 2023; the busiest was Jun 2023, with 3 of 4.
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.
What callers claimed
1 of its 4 FTC complaints (25%) is about computer and tech support; across area code 303 that isn't one of the 8 commonest call types (each of those is at least 1% of its FTC complaints).
Complaint categories chosen by FTC complainants:
- Not specified / other 3 · 75%
- Computer & technical support 1 · 25%
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 4 complaints describe debt collection.
Nearby numbers in 303-381
The closest reported numbers on either side of (303) 381-3633, in number order.
When the calls came
Day of the week of 4 calls; most often Wednesday (2):
The date and time of the call as complainants entered them on the FTC form; the time zone isn't recorded. Times entered as exactly midnight or noon are left out (they're usually the form's default).
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.
None of 4 complainants have area code 303, the number's own. The calls reached people elsewhere, so this isn't a local caller to them.
Most FTC complainants were in Minnesota (3 of 4); others in Montana (1). Statewide, Minnesota ranks #48 of the 50 states and DC for Do Not Call complaints per resident: 26,046 in the last 12 months, 446.7 per 100,000 people. Spam calls in Minnesota.
Where FTC complainants were located (U.S. states):
- Minnesota 3 · 75%
- Montana 1 · 25%
Complainants' cities:
Ismay, MT (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) 381-3633
- Who called me from (303) 381-3633?
- No complaint names the caller; FTC complainants most often said the calls were about computer and tech support. 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) 381-3633 a scam?
- Canadial rates it low risk, from 4 complaints, latest Jun 23, 2023, 0% robocalls.
- Is (303) 381-3633 a debt collector or collection agency?
- Nothing says it is: none of its 4 complaints describe debt collection.
- Should I call (303) 381-3633 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) 381-3633 been reported?
- 4 complaints to the U.S. FTC's Do Not Call registry between Jan 18, 2023 and Jun 23, 2023.
- What do callers from (303) 381-3633 say?
- 1 of its 4 FTC complaints (25%) is about computer and tech support; across area code 303 that isn't one of the 8 commonest call types (each of those is at least 1% of its FTC complaints).
- When does (303) 381-3633 call?
- In FTC complaints, the most common day was Wednesday (2 of 4).
Data updated: FTC complaints through Nov 13, 2026; numbering records as of Nov 3, 2026; community reports live. How this page is built.