Who called you?
(303) 427-4503
(303) 427-4503 is a landline / voip number from Denver, CO on a prefix assigned to QWEST CORPORATION. The FCC has 1 unwanted-call complaint on record for this number, most recently 2026-05-26.
Who called me from (303) 427-4503?
Carrier & location
- Type
- Landline / VoIP
- Assigned carrier
- QWEST CORPORATION
- Rate center
- Denver, CO
- Area code
- 303 — CO
- Time zone
- M
This prefix is assigned to a wireline or VoIP operator. VoIP lines are cheap to obtain in bulk, which makes them a common vehicle for spam and scam calling campaigns. Carrier assignment shows who the prefix was allocated to; numbers can be ported, and caller ID can be spoofed.
FCC complaint history
Consumers filed 1 unwanted-call complaint naming (303) 427-4503 with the FCC, most recently on 2026-05-26. Source: FCC Consumer Complaint Data, public record.
Did this number call you? What was it?
Complaint pattern for (303) 427-4503
What the 1 public FCC complaint naming this number show about when the calls happened, where they landed and how they were placed. Derived from the FCC Consumer Complaint Data Center, a public record.
All 1 complaints were filed on the same day (2026-05-26) — a single burst rather than sustained calling.
Where the complaints came from
- CO1
Every complaint came from a single state (CO), which is more consistent with a local or regional caller than a national campaign.
How the calls were placed
- Prerecorded Voice
- 1
- Internet (VOIP)
- 1
Prerecorded Voice: A recorded message rather than a person. Prerecorded marketing calls to a mobile require prior express written consent under the TCPA.
Internet (VOIP): Reported as arriving over a VoIP service. VoIP origination is cheap to obtain and quick to abandon, which is why high-volume campaigns favour it.
Prefix and area context
5 other numbers on the (303) 427 block have complaints too — 8 across the block in total. None of them overlap in time with this number, so the block activity looks like separate episodes rather than one campaign.
Within area code 303 (CO), this is the 375th most-complained-about number of the 5,018 that have any complaint on record.
Source: FCC Consumer Complaint Data Center. Complaints are unverified consumer submissions: they record what someone reported, not a finding against the caller. Numbers can be spoofed, so a complaint may describe a call that only displayed this number.
FCC complaint log for (303) 427-4503
The most recent unwanted-call complaints US consumers filed with the FCC naming this number — type of issue, contact method, and the state the complaint came from. Public record, imported nightly.
| Date | Call type | Method | State |
|---|---|---|---|
| 2026-05-26 | Prerecorded Voice | Internet (VOIP) | CO |
Is (303) 427-4503 a scam? Community reports
No community reports for (303) 427-4503 yet. If this number called you, you're likely the first — leave a report below and help the next person who searches it.
Other reported numbers starting (303) 427
Robocall campaigns often rotate through a block of numbers on the same prefix — if several neighbors have complaints too, that's campaign behavior.
What to do next
Block it on Android or iPhone, turn on your carrier's free filtering, and report the call to the FCC and FTC — those complaints are the public record this page is built from.
Related
FAQs about (303) 427-4503
Who called me from (303) 427-4503?
(303) 427-4503 is a landline / voip number on a prefix assigned to QWEST CORPORATION, based in Denver, CO. The FCC has logged 1 unwanted-call complaint against this number. Check the community reports on this page for first-hand accounts of what the call was about.
Is (303) 427-4503 a scam or robocall?
The FCC's public complaint data contains 1 complaint about unwanted calls from (303) 427-4503, including 1 categorized as robocalls. That is a strong signal, but not proof — read the community reports and never share personal or payment information with an unsolicited caller.
Should I call (303) 427-4503 back?
Complaints about this number are current — the most recent was filed 60 days ago — so calling back is not advisable. As a general rule, only return a call you were expecting: a caller with legitimate business will leave a voicemail.
WhoCalledLookup is not a consumer reporting agency (FCRA). Community reports are user opinions, not statements of fact by this site. Own this number? Dispute a listing.