408 Area Code: San Jose, California
Area code 408 serves San Jose, Sunnyvale and Campbell, California in the Pacific time zone, in service since 1959. Consumers have filed 6,220 unwanted-call complaints against 4,618 different 408 numbers, 442 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 408 at a glance
- State
- California
- Main cities
- San Jose, Sunnyvale, Campbell, Los Gatos, Morgan Hill, Gilroy + 5 more
- Counties
- Santa Clara County, Monterey County, San Benito County, Marin County
- Local time
- —Pacific
- In service since
- 1959
- Split from
- 415
- Overlay code
- 669 (2012)
- Codes split off
- 831 (1998)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 14 rate centers, 787 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 408 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 408 numbers are about
1,297 FTC Do Not Call complaints about 408 numbers since Jul 24. The most common named subject is debt-relief pitches, at 14% of complaints (80% of those were recorded messages). Overall, 64% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified51840%
- Dropped call / no message18314%
- Debt reduction17914%
- Impostor (government, business, family)15412%
- No subject given1078%
- Home improvement & cleaning413%
- Energy, solar & utilities403%
FCC complaints by call type, last 2 years
- Live Voice12460%
- Prerecorded Voice5627%
- Text Message2713%
13% of recent FCC complaints about 408 numbers are about text messages, not calls.
When 408 spam calls come in
34% of complaints that give a call time describe calls between 10am and 1pm. 94% 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?
471 FTC complaints about 408 numbers in the last four weeks, up 1% on the four weeks before. FCC complaints about 408 numbers peaked in 2017 (701); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
69% of the FTC complaints about 408 numbers came from California residents, but only 37% from people with 408 numbers themselves. The calls are mostly regional rather than aimed at 408 phones specifically.
Where complainants live
- California89669%
- Florida423%
- Texas302%
- Illinois252%
- Washington252%
What people with 408 numbers report
People whose own number starts with 408 filed 2,437 FTC complaints since Jul 24. 20% were about calls showing another 408 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 408 (same code)47620%
- 877 (toll-free)1175%
- 866 (toll-free)964%
- 855 (toll-free)894%
- 833 (toll-free)894%
Likely campaigns using 408 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 408 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 |
|---|---|---|---|---|
| (408) 372-xxxxcampaign | 47 | 41 | Onvoy (Sinch) | San Jose North |
| (408) 883-xxxx | 17 | 17 | Bandwidth.com | San Jose North |
| (408) 897-xxxxcampaign | 11 | 10 | Global Valley Networks | San Antonio |
| (408) 740-xxxxcampaign | 10 | 10 | Ip Horizon LLC | Saratoga |
| (408) 470-xxxx | 10 | 10 | Teleport Communications America, LLC | Sunnyvale |
Carriers operating in 408
NANPA has assigned 787 408 prefixes (NPA-NXX central-office codes) across 14 rate centers: 29% to wireless carriers, 70% to landline and VoIP operators; 56% are pooled blocks shared by several carriers. 1 prefix was assigned in the last 12 months (newest 2026-05-21). 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) | 328(42%) | 7 | 2012-12-26 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 70(9%) | 9 | 2022-08-22 |
| Verizon Wireless (Cellco Partnership) | Wireless | 65(8%) | 9 | 2024-12-17 |
| T-Mobile USA | Wireless | 42(5%) | 9 | 2024-02-29 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 39(5%) | 6 | 2012-05-17 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 35(4%) | 10 | 2026-05-21 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 31(4%) | 8 | 2013-05-21 |
| Spok, INC. | Wireless | 27(3%) | 1 | — |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 21(3%) | 9 | 2025-04-07 |
| Bandwidth.com | Competitive / VoIP (CLEC) | 20(3%) | 8 | 2014-11-10 |
| Metro by T-Mobile (MetroPCS) | Wireless | 20(3%) | 5 | 2011-11-17 |
| Frontier Communications | Incumbent landline (ILEC) | 17(2%) | 3 | — |
Largest rate centers (exchanges) by prefixes: San Jose West (321), San Jose North (139), Sunnyvale (96), San Jose South (84), Campbell (43), Los Gatos (24), Morgan Hill (19), Gilroy (16), San Martin (15), Saratoga (15). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 408 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 408 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- 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 408: questions answered from the data
Where is area code 408?
Area code 408 serves San Jose, Sunnyvale and Campbell, California, covering Santa Clara County, Monterey County and San Benito County and 1 more county. It has been in service since 1959. It was split from area code 415.
What time zone is area code 408 in?
Area code 408 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.
Which area codes overlay 408?
669 (in service 2012) serves the same area as 408. New numbers there can be issued with any of these codes, and local calls need all 10 digits. A spoofed call can display any of them.
What are calls from 408 numbers usually about?
Since Jul 24, consumers filed 1,297 FTC Do Not Call complaints about 408 numbers. The most common named subject was debt-relief pitches: 14% of complaints, 80% of them recorded messages. Across all subjects, 64% of callers who answered the question said the call was a robocall.
When do 408 spam calls happen?
34% of the complaints that give a call time describe calls between 10am and 1pm, and 94% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 408 numbers really local?
Not necessarily. 69% of the FTC complaints about 408 numbers came from California residents, but only 37% from people with 408 numbers themselves. The calls are mostly regional rather than aimed at 408 phones specifically.
Are 408 robocalls increasing?
In the four weeks to Oct 15, consumers filed 471 FTC complaints about 408 numbers, 1% more than the four weeks before.
How do I report a 408 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.
Overlay and nearby 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.