925 Area Code: Walnut Creek, California
Area code 925 serves Walnut Creek, Concord and Pleasanton, California in the Pacific time zone, in service since 1998. Consumers have filed 4,099 unwanted-call complaints against 3,404 different 925 numbers, 593 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 925 at a glance
- State
- California
- Main cities
- Walnut Creek, Concord, Pleasanton, Antioch, Livermore, Bishop Ranch + 10 more
- Counties
- Contra Costa County, Alameda County
- Local time
- —Pacific
- In service since
- March 14, 1998
- Split from
- 510
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 17 rate centers, 640 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 925 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
What calls from 925 numbers are about
1,675 FTC Do Not Call complaints about 925 numbers since Jul 24. The most common named subject is debt-relief pitches, at 13% of complaints (85% of those were recorded messages). Overall, 68% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified81349%
- Debt reduction21513%
- Dropped call / no message21113%
- Impostor (government, business, family)1328%
- No subject given966%
- Medical & prescriptions734%
- Warranties & protection plans473%
FCC complaints by call type, last 2 years
- Live Voice9044%
- Prerecorded Voice7939%
- Text Message3517%
17% of recent FCC complaints about 925 numbers are about text messages, not calls.
When 925 spam calls come in
33% of complaints that give a call time describe calls between 12pm and 3pm. 93% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
650 FTC complaints about 925 numbers in the last four weeks; leaving out the concentrated source below, complaints are up 42% on the four weeks before. FCC complaints about 925 numbers peaked in 2017 (407); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
Data note: 135 of the last four weeks' 925 complaints (21%) came from one place, Pleasant Hill, CA (callers' own phones in area code 925), about 6× the state's per-resident rate. That pattern usually means one or a few very active filers, so trend figures here leave it out.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
55% of the FTC complaints about 925 numbers came from people whose own phone number also starts with 925, and 73% from California. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
These shares include Pleasant Hill, CA, flagged under “Is it getting worse?” as an unusually concentrated source.
Where complainants live
- California1,22173%
- Florida453%
- New Jersey392%
- Texas302%
- New York251%
What people with 925 numbers report
People whose own number starts with 925 filed 2,595 FTC complaints since Jul 24. 35% were about calls showing another 925 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 925 (same code)91335%
- 5101566%
- 877 (toll-free)843%
- 833 (toll-free)733%
- 855 (toll-free)622%
Busiest 925 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (925) 500-xxxx | 29 | 27 | Onvoy (Sinch) | Martinez |
| (925) 693-xxxx | 24 | 6 | Teleport Communications America, LLC | Clayton |
| (925) 695-xxxx | 16 | 16 | Metro by T-Mobile (MetroPCS) | Concord |
| (925) 966-xxxx | 12 | 11 | Fractel, LLC | Antioch |
| (925) 723-xxxx | 11 | 11 | U.S. Telepacific CORP. dba Tpx Communications | Martinez |
Carriers operating in 925
NANPA has assigned 640 925 prefixes (NPA-NXX central-office codes) across 17 rate centers: 26% to wireless carriers, 73% to landline and VoIP operators; 70% are pooled blocks shared by several carriers. 11 prefixes were assigned in the last 12 months (newest 2026-09-14). 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 |
|---|---|---|---|---|
| Pacific Bell (AT&T) | Incumbent landline (ILEC) | 206(32%) | 17 | 2001-01-26 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 48(8%) | 11 | 2026-01-07 |
| T-Mobile USA | Wireless | 44(7%) | 12 | 2026-08-20 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 39(6%) | 16 | 2001-04-24 |
| Verizon Wireless (Cellco Partnership) | Wireless | 38(6%) | 9 | 2023-10-02 |
| U.S. Telepacific CORP. dba Tpx Communications | Competitive / VoIP (CLEC) | 37(6%) | 17 | 2022-06-29 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 33(5%) | 14 | 2019-08-06 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 32(5%) | 13 | 2026-09-14 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 25(4%) | 16 | 2026-05-08 |
| Metro by T-Mobile (MetroPCS) | Wireless | 23(4%) | 8 | 2018-03-23 |
| Matrix Telecom, LLC. S/I/I Tnci | Competitive / VoIP (CLEC) | 20(3%) | 16 | — |
| Fractel, LLC | Competitive / VoIP (CLEC) | 14(2%) | 7 | 2021-08-05 |
Largest rate centers (exchanges) by prefixes: Walnut Creek (103), Concord (89), Pleasanton (76), Antioch (67), Livermore (50), Bishop Ranch (43), Dublin–San Ramon (42), Danville (38), East Contra Costa (22), Martinez (22). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 925 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 925 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- If it looks like a neighbor's number, it may be spoofed. See calls from your own area code.
- 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 925: questions answered from the data
Where is area code 925?
Area code 925 serves Walnut Creek, Concord and Pleasanton, California, covering Contra Costa County and Alameda County. It has been in service since March 14, 1998. It was split from area code 510.
What time zone is area code 925 in?
Area code 925 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.
What are calls from 925 numbers usually about?
Since Jul 24, consumers filed 1,675 FTC Do Not Call complaints about 925 numbers. The most common named subject was debt-relief pitches: 13% of complaints, 85% of them recorded messages. Across all subjects, 68% of callers who answered the question said the call was a robocall.
When do 925 spam calls happen?
33% of the complaints that give a call time describe calls between 12pm and 3pm, and 93% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 925 numbers really local?
Not necessarily. 55% of the FTC complaints about 925 numbers came from people whose own phone number also starts with 925, and 73% from California. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
Are 925 robocalls increasing?
In the four weeks to Oct 15, consumers filed 650 FTC complaints about 925 numbers. Leaving out one town that filed an unusual share of them, that is 42% more than the four weeks before.
How do I report a 925 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.
Other California 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.