738 Area Code: Los Angeles, California
Area code 738 serves Los Angeles and Montebello, California in the Pacific time zone, in service since 2024. Consumers have filed 68 unwanted-call complaints against 62 different 738 numbers, 22 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 738 at a glance
- State
- California
- Main cities
- Los Angeles, Montebello
- County
- Los Angeles County
- Local time
- —Pacific
- In service since
- November 1, 2024
- Overlay of
- 323
- Overlay code
- 213 (1947)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 15 rate centers, 29 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 738 numbers
No single 738 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
What calls from 738 numbers are about
53 FTC Do Not Call complaints about 738 numbers since Jul 24. The most common named subject is debt-relief pitches, at 9% of complaints (100% of those were recorded messages). Overall, 76% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified2140%
- Dropped call / no message1834%
- Debt reduction59%
- No subject given48%
- Impostor (government, business, family)36%
- Home improvement & cleaning12%
- Medical & prescriptions12%
When 738 spam calls come in
54% of complaints that give a call time describe calls between 10am and 1pm. 100% came Monday to Friday, most on Thursdays, 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?
FCC complaints about 738 numbers peaked in 2016 (4); 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
72% of the FTC complaints about 738 numbers came from California residents, but only 0% from people with 738 numbers themselves. The calls are mostly regional rather than aimed at 738 phones specifically.
Where complainants live
- California3872%
- Ohio36%
- Pennsylvania36%
- Alabama24%
- New York24%
Carriers operating in 738
NANPA has assigned 29 738 prefixes (NPA-NXX central-office codes) across 15 rate centers: 14% to wireless carriers, 83% to landline and VoIP operators; 100% are pooled blocks shared by several carriers. 25 prefixes were assigned in the last 12 months (newest 2026-10-09). 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 |
|---|---|---|---|---|
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 18(62%) | 14 | 2026-10-09 |
| Wide Voice, LLC | Competitive / VoIP (CLEC) | 4(14%) | 4 | 2025-10-03 |
| T-Mobile USA | Wireless | 2(7%) | 2 | 2025-12-10 |
| 8x8, INC. | Competitive / VoIP (CLEC) | 1(3%) | 1 | 2026-05-20 |
| Boost Subscriberco L.L.C. | Wireless | 1(3%) | 1 | 2026-09-10 |
| Exiant Communications LLC | Competitive / VoIP (CLEC) | 1(3%) | 1 | 2026-03-03 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 1(3%) | 1 | 2026-10-02 |
| Opentact INC. | Unclassified | 1(3%) | 1 | 2026-06-04 |
Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 738 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 738 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 738: questions answered from the data
Where is area code 738?
Area code 738 serves Los Angeles and Montebello, California, covering Los Angeles County. It has been in service since November 1, 2024.
What time zone is area code 738 in?
Area code 738 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 738?
213 (in service 1947) serves the same area as 738. 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 738 numbers usually about?
Since Jul 24, consumers filed 53 FTC Do Not Call complaints about 738 numbers. The most common named subject was debt-relief pitches: 9% of complaints, 100% of them recorded messages. Across all subjects, 76% of callers who answered the question said the call was a robocall.
When do 738 spam calls happen?
54% of the complaints that give a call time describe calls between 10am and 1pm, and 100% came on weekdays, most often on Thursday. Times are as consumers reported them.
Are calls from 738 numbers really local?
Not necessarily. 72% of the FTC complaints about 738 numbers came from California residents, but only 0% from people with 738 numbers themselves. The calls are mostly regional rather than aimed at 738 phones specifically.
How do I report a 738 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.