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Before You Call Back

Area code 840

Area code 840 serves California, including Pomona, San Bernardino and Arrowhead (Pacific time). It has been in service since February 23, 2021 and shares its area with 909.

Numbers starting with 840 drew 453 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 113 complaints to the FCC since November 2023. The number on your screen can be faked, so an 840 number proves nothing about where a call came from.

Location
CaliforniaLos Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area and Riverside-San Bernardino-Ontario, CA Metropolitan Statistical Area
Time zone
Pacific
In service since
February 23, 2021Created from 909
Overlay
Same area as 909
Local calls
Dial 1 + 10 digits
Exchanges in use
132 of 792held by 15 carriers
Projected to run out
3Q 2061NANPA forecast 2026.2

Complaints about 840 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 840. These are counts of what people reported; the agencies do not verify them.

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

453

FCC complaints since November 2023

113

Different 840 numbers reported

407

FCC complaints naming an 840 number, by month

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

Show as a table
MonthComplaints
November 20231
December 20233
January 20245
February 20242
March 20243
April 20241
May 20243
June 20242
July 20246
August 20242
September 20244
October 20244
November 20244
December 20243
January 20254
February 20252
March 20252
April 20250
May 20254
June 20251
July 20255
August 20250
September 20251
October 20250
November 20250
December 20253
January 20263
February 20263
March 20261
April 20262
May 20263
June 20262
July 20263
August 20264
September 202621
October 20264

What people said 840 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 351 of 453 reports were robocalls.

Show as a table
SubjectReports
Reducing your debt (credit cards, mortgage, student loans)170
Other166
Calls pretending to be government, businesses, or family and friends69
Dropped call or no message15
Lotteries, prizes, and sweepstakes3
Medical and prescriptions3

Most reported 840 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 840

NANPA lists 19 rate centers for 840. 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.
  • Pomona16
  • San Bernardino16
  • Arrowhead14
  • Fontana12
  • Chino9
  • Claremont8
  • Ontario8
  • Upland7
  • Colton6
  • Highland6
  • Marshall5
  • Redlands5
  • Rialto5
  • Calimesa4
  • Diamond Bar4
  • Etiwanda3
  • Mentone2
  • Big Bear City1
  • Crestline1

Phone companies holding 840 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 8 of 15 carriers

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

Show as a table
Carrier (legal name)Exchanges
T-Mobile USA, Inc.32
Fractel, LLC26
Onvoy, LLC - CA25
New Cingular Wireless PCS, LLC18
Cellco Partnership dba Verizon Wireless - CA13
Bandwidth.com CLEC, LLC - CA4
Onvoy Spectrum, LLC3
Terra Nova Telecom Inc.3

When today's 840 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
20209
202127
202219
202325
202418
202519
202615

Check an 840 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