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Before You Call Back

Area code 837

Area code 837 serves California, including Redding, Auburn and Chico (Pacific time). It has been in service since January 31, 2025 and shares its area with 530.

Numbers starting with 837 drew 5 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 1 complaint to the FCC since November 2023. The number on your screen can be faked, so an 837 number proves nothing about where a call came from.

Location
CaliforniaSacramento--Roseville--Folsom, CA Metropolitan Statistical Area
Time zone
Pacific
In service since
January 31, 2025Created from 530
Overlay
Same area as 530
Local calls
Dial 1 + 10 digits
Exchanges in use
11 of 792held by 4 carriers
Projected to run out
1Q 2099NANPA forecast 2026.2

Complaints about 837 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 837. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

5

FCC complaints since November 2023

1

Different 837 numbers reported

6

FCC complaints naming an 837 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 20230
December 20230
January 20240
February 20240
March 20240
April 20240
May 20240
June 20240
July 20240
August 20240
September 20240
October 20240
November 20240
December 20240
January 20250
February 20250
March 20250
April 20250
May 20250
June 20250
July 20250
August 20251
September 20250
October 20250
November 20250
December 20250
January 20260
February 20260
March 20260
April 20260
May 20260
June 20260
July 20260
August 20260
September 20260
October 20260

What people said 837 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 5 of 5 reports were robocalls.

Show as a table
SubjectReports
Reducing your debt (credit cards, mortgage, student loans)2
Medical and prescriptions1
Dropped call or no message1

Places served by 837

NANPA lists 10 rate centers for 837. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Redding2
  • Auburn: Main DA1
  • Chico1
  • Homewood1
  • Hornbrook1
  • Nevada City1
  • North Tahoe: Tahoe City DA1
  • Red Bluff1
  • Shingle Springs1
  • Truckee1

Phone companies holding 837 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 100% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 4 of 4 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
Onvoy, LLC - CA6
Exiant Communications LLC2
Wide Voice, LLC - CA2
Opentact Inc.1

Check an 837 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in California

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show