837 Area Code: Redding, California
Area code 837 serves Redding, Red Bluff and Shingle Springs, California in the Pacific time zone, in service since 2025. Consumers have filed 22 unwanted-call complaints against 20 different 837 numbers, 2 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 837 at a glance
- State
- California
- Main cities
- Redding, Red Bluff, Shingle Springs, North Lake Tahoe, Nevada City, Truckee + 1 more
- Counties
- Shasta County, Nevada County, Tehama County, El Dorado County + 2 more
- Local time
- —Pacific
- In service since
- January 31, 2025
- Overlay of
- 530
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 7 rate centers, 11 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 837 numbers
No single 837 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.
Is it getting worse?
FCC complaints about 837 numbers peaked in 2016 (4); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Carriers operating in 837
NANPA has assigned 11 837 prefixes (NPA-NXX central-office codes) across 10 rate centers: 0% to wireless carriers, 91% to landline and VoIP operators; 100% are pooled blocks shared by several carriers. 11 prefixes were assigned in the last 12 months (newest 2026-10-09). 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 |
|---|---|---|---|---|
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 6(55%) | 6 | 2026-10-09 |
| Exiant Communications LLC | Competitive / VoIP (CLEC) | 2(18%) | 2 | 2026-09-02 |
| Wide Voice, LLC | Competitive / VoIP (CLEC) | 2(18%) | 2 | 2026-09-01 |
| Opentact INC. | Unclassified | 1(9%) | 1 | 2026-09-02 |
Largest rate centers (exchanges) by prefixes: Redding (2), Auburn (1), Chico (1), Homewood (1), Hornbrook (1), Nevada City (1), North Lake Tahoe (1), Red Bluff (1), Shingle Springs (1), Truckee (1). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 837 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 837 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 California
- 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: California Attorney General.
- California formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
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 837: questions answered from the data
Where is area code 837?
Area code 837 serves Redding, Red Bluff and Shingle Springs, California, covering Shasta County, Nevada County and Tehama County and 3 more counties. It has been in service since January 31, 2025.
What time zone is area code 837 in?
Area code 837 is in the Pacific time zone (UTC−8, or UTC−7 during daylight saving time). The current local time is shown at the top of this page.
How do I report an 837 scam call in California?
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 California, the California Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby 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.