Area Code 857 Phone Number
for Your Business
Get a local 857 number for your business in Boston, MA. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 857?
Area code 857 is a North American telephone area code serving Boston, Massachusetts and 1 other city in the region. It has been in service since May 2, 2001 and operates on Eastern Time. It is part of the 617/857 overlay complex. Businesses operating in the 857 area code region use local numbers to build trust with customers, improve answer rates, and establish a professional local presence.
With Zonitel, you can get a new 857 area code number or port your existing one with guided onboarding — no hardware required. Your team can make and receive calls from any device using the Zonitel mobile app or web portal.
Area Code 857 at a Glance
- Region
- Boston (overlay), Massachusetts
- In service
- Since May 2, 2001
- Time zone
- Eastern Time
- Overlay
- Shares its territory with 617; local calls use 10-digit dialing
- History
- Added on May 2, 2001 as an overlay of 617
- Telemarketing hours
- 8 a.m.–9 p.m. Eastern Time for residential numbers (TCPA, 47 CFR 64.1200(c)(1))
Cities Served by Area Code 857
Why Your Business Needs a 857 Local Number
A local number tells customers you're part of the community. People in Boston are more likely to pick up a call from a 857 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 857 Number
Zonitel is not just a phone number — it's a complete cloud business phone system. Every plan includes:
Frequently Asked Questions About Area Code 857
What cities use area code 857?
Area code 857 serves the Boston (overlay) area of Massachusetts. Cities in the 857 region include Boston, MA; Cambridge, MA.
Is area code 857 an overlay?
Yes. 857 is part of the 617/857 overlay, so new numbers in this region can come from any of those area codes, and local calls require 10-digit dialing.
What time zone is area code 857 in?
Area code 857 is in Eastern Time. Telemarketing calls to residential 857 numbers are limited to 8 a.m.–9 p.m. Eastern Time under the TCPA (47 CFR 64.1200(c)(1)).
Can I get a 857 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 857 area code number regardless of where your business is physically located. This lets you establish a local presence in Boston without a physical office.
Can I keep my existing 857 number and switch to Zonitel?
Yes. Number porting is free. Porting commonly takes 5–10 business days depending on your current carrier, and your old service stays active until the coordinated cutover.
How much does a 857 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 857 local number is included in the plan.
Get Your 857 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.