712 Area Code: Sioux City, Iowa
Area code 712 serves Sioux City, Council Bluffs and Sergeant Bluff, Iowa in the Central time zone, in service since 1947. Consumers have filed 3,393 unwanted-call complaints against 3,042 different 712 numbers, 288 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 712 at a glance
- State
- Iowa
- Main cities
- Sioux City, Council Bluffs, Sergeant Bluff + 236 more
- Counties
- Plymouth County, Pottawattamie County, Woodbury County, Sioux County + 28 more
- Local time
- —Central
- In service since
- 1947
- Local dialing
- 7 digits allowed
- Exchanges
- 244 rate centers, 633 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 712 numbers
No single 712 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
What calls from 712 numbers are about
1,067 FTC Do Not Call complaints about 712 numbers since Jul 24. The most common named subject is debt-relief pitches, at 29% of complaints (92% of those were recorded messages). Overall, 81% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified39337%
- Debt reduction30829%
- Impostor (government, business, family)10210%
- Medical & prescriptions1009%
- Dropped call / no message707%
- No subject given596%
- Warranties & protection plans151%
FCC complaints by call type, last 2 years
- Prerecorded Voice28981%
- Live Voice4814%
- Text Message185%
Live-voice calls are from a person; prerecorded calls are robocalls.
When 712 spam calls come in
31% of complaints that give a call time describe calls between 11am and 2pm. 94% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
281 FTC complaints about 712 numbers in the last four weeks, down 14% on the four weeks before. FCC complaints about 712 numbers peaked in 2021 (369); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
Only 47% of the FTC complaints about 712 numbers came from Iowa residents; the most came from California, Florida and New York. 712 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- Iowa50347%
- California686%
- Florida656%
- New York323%
- Texas303%
What people with 712 numbers report
People whose own number starts with 712 filed 1,009 FTC complaints since Jul 24. 46% were about calls showing another 712 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 712 (same code)46946%
- 833 (toll-free)566%
- 888 (toll-free)444%
- 877 (toll-free)303%
- 855 (toll-free)273%
Likely campaigns using 712 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 712 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
Carriers operating in 712
NANPA has assigned 633 712 prefixes (NPA-NXX central-office codes) across 244 rate centers: 26% to wireless carriers, 65% to landline and VoIP operators; 69% are pooled blocks shared by several carriers. 9 prefixes were assigned in the last 12 months (newest 2026-08-05). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Verizon Wireless (Cellco Partnership) | Wireless | 68(11%) | 40 | 2025-04-18 |
| Qwest (CenturyLink / Lumen) | Incumbent landline (ILEC) | 64(10%) | 37 | 2020-09-23 |
| Windstream | Incumbent landline (ILEC) | 48(8%) | 40 | 2018-02-01 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 43(7%) | 25 | 2026-08-05 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 31(5%) | 28 | 2026-07-28 |
| Frontier Communications | Incumbent landline (ILEC) | 24(4%) | 22 | — |
| UScellular | Wireless | 20(3%) | 17 | 2003-07-24 |
| Windstream | Incumbent landline (ILEC) | 20(3%) | 19 | 2012-07-23 |
| T-Mobile USA | Wireless | 17(3%) | 12 | 2025-06-12 |
| Northwest Iowa Telephone, LLC | Unclassified | 14(2%) | 3 | 2003-02-21 |
| Windstream | Incumbent landline (ILEC) | 12(2%) | 9 | 2018-07-06 |
| Ton80 Communications, LLC | Competitive / VoIP (CLEC) | 11(2%) | 11 | 2022-03-16 |
Largest rate centers (exchanges) by prefixes: Sioux City (73), Council Bluffs (29), Sergeant Bluff (13), Spencer (11), Le Mars (10), Carroll (9), Harlan (8), Storm Lake (8), Atlantic (7), Denison (7). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 712 numbers
Before you call back
- Debt reduction is the top named complaint here. Don't pay upfront fees for debt relief; the FTC's Telemarketing Sales Rule bans them. Talk to your lender or a nonprofit credit counselor instead. Read about debt-relief robocalls.
- Look up the full number above. A missed call from 712 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in Iowa
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: Iowa Attorney General.
- Iowa does not run its own Do Not Call registry and has not formally adopted the federal list as a state list. The federal National Do Not Call Registry at donotcall.gov still applies to you — register there, free, and it never expires.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 712: questions answered from the data
Where is area code 712?
Area code 712 serves Sioux City, Council Bluffs and Sergeant Bluff, Iowa, covering Plymouth County, Pottawattamie County and Woodbury County and 29 more counties. It has been in service since 1947.
What time zone is area code 712 in?
Area code 712 is in the Central time zone (UTC−6, or UTC−5 during daylight saving time). The current local time is shown at the top of this page.
What are calls from 712 numbers usually about?
Since Jul 24, consumers filed 1,067 FTC Do Not Call complaints about 712 numbers. The most common named subject was debt-relief pitches: 29% of complaints, 92% of them recorded messages. Across all subjects, 81% of callers who answered the question said the call was a robocall.
When do 712 spam calls happen?
31% of the complaints that give a call time describe calls between 11am and 2pm, and 94% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 712 numbers really local?
Not necessarily. Only 47% of the FTC complaints about 712 numbers came from Iowa residents; the most came from California, Florida and New York. 712 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 712 robocalls increasing?
In the four weeks to Oct 20, consumers filed 281 FTC complaints about 712 numbers, 14% fewer than the four weeks before.
How do I report a 712 scam call in Iowa?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In Iowa, the Iowa Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Other Iowa area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.