Who called you?
(312) 748-3505
(312) 748-3505 is a landline / voip number from Chicgozn01, IL on a prefix assigned to Onvoy (Sinch). Consumers have filed 4 complaints about it: 2 with the FTC's Do Not Call Registry and 2 with the FCC, most recently on 2026-08-25.
Reported this month — 1 FTC complaint in the last 30 days, most recently 23 days ago, for robocalls.
Who called me from (312) 748-3505?
Carrier & location
- Type
- Landline / VoIP
- Assigned carrier
- Onvoy (Sinch)
- Rate center
- Chicgozn01, IL
- Prefix 312-748
- assigned 2023-05-22, pooled block
- Area code
- 312 — Illinois
- Time zone
- C
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.
Complaint history
- FTC Do Not Call reports
- 22026-08-10 → 2026-08-25
- FCC complaints
- 22024-09-27 → 2025-12-11
- Community reports
- 0
FTC Do Not Call complaints (unverified consumer reports); FCC Consumer Complaint Data, public record. Complaints run from 2024-09-27 to 2026-08-25.
Did this number call you? What was it?
What (312) 748-3505 was reported for
2 consumers reported this number to the FTC's National Do Not Call Registry between 2026-08-10 and 2026-08-25. Source: FTC Do Not Call complaints (unverified consumer reports).
Reported this month — 1 FTC complaint in the last 30 days, most recently 23 days ago, for robocalls.
Reported for
The subject each consumer chose when filing. “Impostor” means the caller claimed to be a government agency, a business, or a relative.
- Dropped call / no message2 (100%)
2 of 2 consumers who answered the question said the call was a recorded message or robocall. Prerecorded sales calls to a cell phone require prior express written consent under the TCPA.
Where it was reported
The state the consumer filed from — where the call landed, not where it originated.
- IL2 (100%)
Most often from Breese, IL.
Recent FTC reports naming (312) 748-3505
The most recent Do Not Call complaints, as filed: the date the consumer reported it, when they said the call happened, what it was about, and the city and state they filed from.
Reported in the last 7 days in area code 312 (Illinois)
Other 312 numbers consumers reported to the FTC this week — useful when a campaign is rotating through an area code.
- (312) 653-20733 this week · Dropped call / no message
- (312) 778-65522 this week · Impostor (government, business, family)
- (312) 212-02921 this week · No subject given
- (312) 268-74931 this week · No subject given
- (312) 273-15861 this week · No subject given
- (312) 313-11881 this week · Dropped call / no message
- (312) 559-40591 this week · Impostor (government, business, family)
- (312) 637-56581 this week · No subject given
- (312) 682-61061 this week · Dropped call / no message
- (312) 702-24451 this week · No subject given
Source: FTC Do Not Call Reported Calls data, published every weekday. These are unverified consumer reports — they record what someone said about a call, not a finding against the number's owner. Caller ID is routinely spoofed, so a report can describe a call that only displayed this number. No reporter is identified beyond city and state.
Complaint pattern for (312) 748-3505
What the 2 public FCC complaints 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.
FCC complaints per month. Peak month: 2024-09 (1).
Complaints span 14 months, from 2024-09-27 to 2025-12-11, with activity recorded in 2 separate months.
How the calls were placed
- Live Voice
- 2
- Internet (VOIP)
- 2
Live Voice: A person was on the line when the call was answered.
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
12 other numbers on the (312) 748 block have complaints too — 14 across the block in total. 2 of them were complained about during the same period as this number, which is what a campaign rotating through a block of consecutive numbers looks like from the outside.
Within area code 312 (Illinois), this is the 362nd most-complained-about number of the 3,007 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 (312) 748-3505
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 |
|---|---|---|---|
| 2025-12-11 | Live Voice | Internet (VOIP) | IN |
| 2024-09-27 | Live Voice | Internet (VOIP) | IL |
Is (312) 748-3505 a scam? Community reports
No community reports for (312) 748-3505 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 (312) 748
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 (312) 748-3505
Who called me from (312) 748-3505?
(312) 748-3505 is a landline / voip number on a prefix assigned to Onvoy (Sinch), based in Chicgozn01, IL. Consumers have filed 4 complaints about it — 2 with the FTC's Do Not Call Registry and 2 with the FCC.
Is (312) 748-3505 a scam or robocall?
2 consumers reported (312) 748-3505 to the FTC, and 100% of those who answered the question said it was a recorded message or robocall. 1 of the reports were filed in the last 30 days, so the campaign is current. Complaints are a strong signal, not proof — never share personal or payment information with an unsolicited caller.
Should I call (312) 748-3505 back?
Reports about this number are current — the most recent FTC complaint was filed 2026-08-25 — 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.
Where were the complaints about (312) 748-3505 filed?
Consumers in 2 states filed complaints about this number, most often from IL, IN. The FCC records the state the complainant filed from, not where the call originated — caller ID can be spoofed to display any number.
WhoCalledLookup is not a consumer reporting agency (FCRA). Community reports are user opinions, not statements of fact by this site; FTC and FCC complaints are unverified consumer submissions. Own this number? Dispute a listing.