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Before You Call Back

Area code 310

Area code 310 serves California, including Compton, Beverly Hills and Santa Monica (Pacific time). It has been in service since November 2, 1991 and shares its area with 424.

Numbers starting with 310 drew 1,157 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 702 complaints to the FCC since November 2023. The number on your screen can be faked, so a 310 number proves nothing about where a call came from.

Location
CaliforniaLos Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area
Time zone
Pacific
In service since
November 2, 1991Created from 213
Overlay
Same area as 424
Local calls
Dial 1 + 10 digits
Exchanges in use
786 of 792held by 25 carriers
Projected to run out
2Q 2044NANPA forecast 2026.2

Complaints about 310 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 310. These are counts of what people reported; the agencies do not verify them.

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

1,157

FCC complaints since November 2023

702

Different 310 numbers reported

1,700

FCC complaints naming a 310 number, by month

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

Show as a table
MonthComplaints
November 202319
December 202313
January 202420
February 20246
March 20248
April 202410
May 20249
June 202413
July 202427
August 202423
September 202428
October 202419
November 202417
December 202410
January 202513
February 202523
March 202520
April 202514
May 202519
June 202514
July 202513
August 202517
September 20258
October 20250
November 20258
December 202510
January 2026106
February 202629
March 202614
April 202673
May 202619
June 202610
July 202615
August 202618
September 202614
October 202614

What people said 310 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 646 of 1,157 reports were robocalls.

Show as a table
SubjectReports
Other508
Dropped call or no message279
Reducing your debt (credit cards, mortgage, student loans)89
Calls pretending to be government, businesses, or family and friends88
Medical and prescriptions36
Home improvement and cleaning30

Most reported 310 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 310

NANPA lists 17 rate centers for 310. 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.
  • Compton: Gardena DA124
  • Beverly Hills113
  • Santa Monica: Santa Monica DA84
  • West Los Angeles69
  • Santa Monica: Mar Vista DA54
  • Inglewood49
  • Compton: Compton DA44
  • Redondo44
  • El Segundo39
  • Culver City36
  • San Pedro35
  • Torrance33
  • Hawthorne31
  • Lomita14
  • Malibu12
  • Avalon3
  • Lakewood2

Phone companies holding 310 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 45% 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 25 carriers

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

Show as a table
Carrier (legal name)Exchanges
Pacific Bell249
Frontier California Inc.137
New Cingular Wireless PCS, LLC68
T-Mobile USA, Inc.58
Cellco Partnership dba Verizon Wireless - CA56
Mcimetro Access Transmission Services LLC - CA27
Spok, Inc.24
U.S. Telepacific Corp. dba Tpx Communications24

When today's 310 exchanges were assigned

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

Show as a table
YearExchanges
200145
200211
20042
200514
20062
20101
20113
20128
20131
20174
20203
20235
20241
20251

Check a 310 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