645 Area Code: Miami, Florida
Area code 645 serves Miami, North Dade and Florida Keys, Florida in the Eastern time zone, in service since 2023. Consumers have filed 623 unwanted-call complaints against 596 different 645 numbers, 121 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 645 at a glance
- State
- Florida
- Main cities
- Miami, North Dade, Florida Keys, Homestead, Perrine
- Counties
- Miami-Dade County, Monroe County
- Local time
- —Eastern
- In service since
- August 4, 2023
- Overlay of
- 305
- Overlay code
- 786 (1998)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 5 rate centers, 78 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 645 numbers
No single 645 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 645 numbers are about
382 FTC Do Not Call complaints about 645 numbers since Jul 24. The most common named subject is debt-relief pitches, at 30% of complaints (95% of those were recorded messages). Overall, 73% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified17045%
- Debt reduction11330%
- Impostor (government, business, family)236%
- No subject given226%
- Dropped call / no message185%
- Medical & prescriptions92%
- Home improvement & cleaning72%
FCC complaints by call type, last 2 years
- Prerecorded Voice15673%
- Live Voice4722%
- Text Message115%
Live-voice calls are from a person; prerecorded calls are robocalls.
When 645 spam calls come in
31% of complaints that give a call time describe calls between 10am and 1pm. 87% came Monday to Friday, most on Thursdays. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
129 FTC complaints about 645 numbers in the last four weeks, up 77% on the four weeks before. FCC complaints about 645 numbers peaked in 2025 (117); 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
Only 40% of the FTC complaints about 645 numbers came from Florida residents; the most came from Texas, California and New York. 645 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- Florida15440%
- Texas267%
- California257%
- New York174%
- Illinois164%
Busiest 645 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 |
|---|---|---|---|---|
| (645) 233-xxxx | 16 | 15 | Onvoy (Sinch) | Miami |
| (645) 800-xxxx | 14 | 14 | Wide Voice, LLC | North Dade |
| (645) 587-xxxx | 11 | 11 | Opentact INC. | Miami |
| (645) 247-xxxx | 8 | 8 | Ip Horizon LLC | North Dade |
| (645) 223-xxxx | 8 | 8 | Boost Subscriberco L.L.C. | Miami |
Carriers operating in 645
NANPA has assigned 78 645 prefixes (NPA-NXX central-office codes) across 5 rate centers: 35% to wireless carriers, 60% to landline and VoIP operators; 97% are pooled blocks shared by several carriers. 12 prefixes were assigned in the last 12 months (newest 2026-09-10). 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 |
|---|---|---|---|---|
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 17(22%) | 5 | 2026-05-04 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 15(19%) | 5 | 2026-08-24 |
| Wide Voice, LLC | Competitive / VoIP (CLEC) | 9(12%) | 5 | 2024-02-09 |
| Eon Telecom, INC. | Competitive / VoIP (CLEC) | 5(6%) | 5 | 2024-03-04 |
| Ip Horizon LLC | Competitive / VoIP (CLEC) | 5(6%) | 5 | 2025-04-30 |
| Omnipoint Miami E License, LLC | Wireless | 5(6%) | 2 | 2024-11-27 |
| Verizon Wireless (Cellco Partnership) | Wireless | 3(4%) | 1 | 2024-09-09 |
| Livewire Telecom, LLC | Competitive / VoIP (CLEC) | 3(4%) | 2 | 2026-03-20 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 3(4%) | 3 | 2024-11-04 |
| Boost Subscriberco L.L.C. | Wireless | 2(3%) | 2 | 2024-07-15 |
| Shelcomm | Unclassified | 2(3%) | 2 | 2024-09-03 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 2(3%) | 1 | 2025-04-09 |
Largest rate centers (exchanges) by prefixes: Miami (38), North Dade (14), Homestead (9), Florida Keys (9), Perrine (8). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 645 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 645 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 Florida
- 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: Florida Attorney General.
- Florida is one of the states that maintains its own Do Not Call registry alongside the federal National Do Not Call Registry, so telemarketers calling Florida numbers are expected to check both lists. Registering on the federal list at donotcall.gov is free and never expires; the state list is administered separately and may have its own registration process and renewal period.
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 645: questions answered from the data
Where is area code 645?
Area code 645 serves Miami, North Dade and Florida Keys, Florida, covering Miami-Dade County and Monroe County. It has been in service since August 4, 2023.
What time zone is area code 645 in?
Area code 645 is in the Eastern time zone (UTC−5, or UTC−4 during daylight saving time). The current local time is shown at the top of this page.
Which area codes overlay 645?
786 (in service 1998) serves the same area as 645. 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 645 numbers usually about?
Since Jul 24, consumers filed 382 FTC Do Not Call complaints about 645 numbers. The most common named subject was debt-relief pitches: 30% of complaints, 95% of them recorded messages. Across all subjects, 73% of callers who answered the question said the call was a robocall.
When do 645 spam calls happen?
31% of the complaints that give a call time describe calls between 10am and 1pm, and 87% came on weekdays, most often on Thursday. Times are as consumers reported them.
Are calls from 645 numbers really local?
Not necessarily. Only 40% of the FTC complaints about 645 numbers came from Florida residents; the most came from Texas, California and New York. 645 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 645 robocalls increasing?
In the four weeks to Oct 15, consumers filed 129 FTC complaints about 645 numbers, 77% more than the four weeks before.
How do I report a 645 scam call in Florida?
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 Florida, the Florida 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.