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Before You Call Back

Area code 350

Area code 350 serves California, including Stockton, Modesto and Atwater (Pacific time). It has been in service since November 28, 2022 and shares its area with 209.

Numbers starting with 350 drew 146 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 64 complaints to the FCC since November 2023. The number on your screen can be faked, so a 350 number proves nothing about where a call came from.

Location
California(modesto, CA Metropolitan Statistical Area) and Fresno, CA Metropolitan Statistical Area
Time zone
Pacific
In service since
November 28, 2022Created from 209
Overlay
Same area as 209
Local calls
Dial 1 + 10 digits
Exchanges in use
88 of 792held by 17 carriers
Projected to run out
3Q 2061NANPA forecast 2026.2

Complaints about 350 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 350. These are counts of what people reported; the agencies do not verify them.

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

146

FCC complaints since November 2023

64

Different 350 numbers reported

167

FCC complaints naming a 350 number, by month

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

Show as a table
MonthComplaints
November 20234
December 20230
January 20243
February 20240
March 20241
April 20241
May 20241
June 20241
July 20241
August 20242
September 20243
October 20242
November 20240
December 20240
January 20250
February 20251
March 20253
April 20250
May 20250
June 20251
July 20253
August 20250
September 20251
October 20250
November 20251
December 20250
January 20262
February 20261
March 20260
April 20264
May 20260
June 20261
July 202619
August 20263
September 20261
October 20262

What people said 350 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 95 of 146 reports were robocalls.

Show as a table
SubjectReports
Other55
Reducing your debt (credit cards, mortgage, student loans)32
Calls pretending to be government, businesses, or family and friends19
Dropped call or no message11
Vacation and timeshares8
Lotteries, prizes, and sweepstakes3

Most reported 350 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 350

NANPA lists 41 rate centers for 350. 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.
  • Stockton11
  • Modesto10
  • Atwater7
  • Manteca5
  • Lodi4
  • Tracy4
  • Turlock4
  • Clements2
  • Dos Palos2
  • Galt2
  • Jackson2
  • Los Banos2
  • Merced2
  • Oakdale2
  • Snelling2
  • Valley Springs2
  • Escalon1
  • Groveland1
  • Gustine1
  • Hughson1
  • Jamestown1
  • Knights Ferry1
  • Le Grand1
  • Linden1
Show all 41 rate centers

Mariposa, Moccasin, Newman, Patterson, Pinecrest, Planada, Ripon, Riverbank, San Andreas, Sonora: Main DA, Sutter Creek, Thornton, Tuolumne, Wallace, Waterford: Don Pedro DA, Waterford: Main DA, Yosemite.

Phone companies holding 350 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 17 carriers

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

Show as a table
Carrier (legal name)Exchanges
Onvoy, LLC - CA20
Onvoy Spectrum, LLC17
New Cingular Wireless PCS, LLC12
Commio, LLC7
T-Mobile USA, Inc.7
Terra Nova Telecom Inc.7
Cellco Partnership dba Verizon Wireless - CA5
Comcast Phone of California, LLC2

When today's 350 exchanges were assigned

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

Show as a table
YearExchanges
202213
202323
202419
202521
202610

Check a 350 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