857 Area Code: Boston, Massachusetts
Area code 857 serves Boston, Cambridge and Brookline, Massachusetts in the Eastern time zone, in service since 2001. Consumers have filed 2,967 unwanted-call complaints against 2,428 different 857 numbers, 639 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 857 at a glance
- State
- Massachusetts
- Main cities
- Boston, Cambridge, Brookline, Roxbury, Newton, Quincy + 14 more
- Counties
- Suffolk County, Middlesex County, Norfolk County
- Local time
- —Eastern
- In service since
- May 2, 2001
- Overlay of
- 617
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 21 rate centers, 363 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 857 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 857 numbers are about
1,533 FTC Do Not Call complaints about 857 numbers since Jul 24. The most common named subject is debt-relief pitches, at 27% of complaints (96% of those were recorded messages). Overall, 83% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified60239%
- Debt reduction40727%
- Impostor (government, business, family)29920%
- No subject given986%
- Dropped call / no message715%
- Energy, solar & utilities121%
- Medical & prescriptions101%
FCC complaints by call type, last 2 years
- Prerecorded Voice14260%
- Live Voice7532%
- Text Message219%
Live-voice calls are from a person; prerecorded calls are robocalls.
When 857 spam calls come in
36% of complaints that give a call time describe calls between 9am and 12pm. 87% came Monday to Friday, most on Wednesdays. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
693 FTC complaints about 857 numbers in the last four weeks, up 124% on the four weeks before. FCC complaints about 857 numbers peaked in 2017 (233); 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 17% of the FTC complaints about 857 numbers came from Massachusetts residents; the most came from Florida, California and Texas. 857 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- Massachusetts25317%
- Florida17011%
- California1158%
- Texas1087%
- New York624%
What people with 857 numbers report
People whose own number starts with 857 filed 494 FTC complaints since Jul 24. 21% were about calls showing another 857 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 857 (same code)10521%
- 833 (toll-free)255%
- 866 (toll-free)194%
- 757184%
- 877 (toll-free)184%
Likely campaigns using 857 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 857 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 |
|---|---|---|---|---|
| (857) 577-xxxx | 133 | 126 | Onvoy (Sinch) | Charlestown |
| (857) 402-xxxx | 112 | 106 | Hd Carrier LLC | East Boston |
| (857) 477-xxxx | 53 | 48 | Onvoy (Sinch) | Jamaica Plain |
| (857) 227-xxxx | 50 | 49 | MCImetro (Verizon Business) | Somerville |
| (857) 336-xxxx | 47 | 44 | Onvoy (Sinch) | Winthrop |
Carriers operating in 857
NANPA has assigned 363 857 prefixes (NPA-NXX central-office codes) across 21 rate centers: 48% to wireless carriers, 50% to landline and VoIP operators; 98% are pooled blocks shared by several carriers. 3 prefixes were assigned in the last 12 months (newest 2026-06-30). 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 |
|---|---|---|---|---|
| Verizon Wireless (Cellco Partnership) | Wireless | 67(18%) | 8 | 2021-05-17 |
| Omnipoint Miami E License, LLC | Wireless | 62(17%) | 6 | 2025-01-07 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 42(12%) | 19 | 2023-06-09 |
| Metro by T-Mobile (MetroPCS) | Wireless | 25(7%) | 8 | 2017-01-31 |
| PAETEC (Windstream) | Competitive / VoIP (CLEC) | 19(5%) | 11 | 2014-04-09 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 18(5%) | 8 | 2024-11-13 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 13(4%) | 9 | 2021-12-08 |
| Verizon (landline) | Incumbent landline (ILEC) | 13(4%) | 6 | 2017-02-01 |
| Bandwidth.com | Competitive / VoIP (CLEC) | 10(3%) | 9 | 2019-02-07 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 10(3%) | 3 | 2017-08-16 |
| Comcast (Xfinity Voice) | Competitive / VoIP (CLEC) | 9(2%) | 7 | 2021-09-10 |
| Ton80 Communications, LLC | Competitive / VoIP (CLEC) | 9(2%) | 9 | 2022-03-22 |
Largest rate centers (exchanges) by prefixes: Boston (152), Cambridge (28), Brookline (27), Roxbury (20), Newton (18), Brighton (14), Quincy (14), Dorchester (13), Charlestown (10), Jamaica Plain (9). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 857 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 857 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 Massachusetts
- 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: Massachusetts Attorney General.
- Massachusetts is one of the states that maintains its own Do Not Call registry alongside the federal National Do Not Call Registry, so telemarketers calling Massachusetts 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 857: questions answered from the data
Where is area code 857?
Area code 857 serves Boston, Cambridge and Brookline, Massachusetts, covering Suffolk County, Middlesex County and Norfolk County. It has been in service since May 2, 2001.
What time zone is area code 857 in?
Area code 857 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.
What are calls from 857 numbers usually about?
Since Jul 24, consumers filed 1,533 FTC Do Not Call complaints about 857 numbers. The most common named subject was debt-relief pitches: 27% of complaints, 96% of them recorded messages. Across all subjects, 83% of callers who answered the question said the call was a robocall.
When do 857 spam calls happen?
36% of the complaints that give a call time describe calls between 9am and 12pm, and 87% came on weekdays, most often on Wednesday. Times are as consumers reported them.
Are calls from 857 numbers really local?
Not necessarily. Only 17% of the FTC complaints about 857 numbers came from Massachusetts residents; the most came from Florida, California and Texas. 857 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 857 robocalls increasing?
In the four weeks to Oct 15, consumers filed 693 FTC complaints about 857 numbers, 124% more than the four weeks before.
How do I report an 857 scam call in Massachusetts?
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 Massachusetts, the Massachusetts 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.