Phone numbers in Cambridge, Massachusetts
Cambridge has 140 phone prefixes in area codes 508, 617, 857.
Biggest holders: Verizon (local phone), T-Mobile (including Sprint), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 24%
- Local phone company 34%
- Internet / business phone carrier 31%
- Paging service 1%
- Phone company 11%
Every prefix in Cambridge
Search the first six digits of a number in this list. If it's here, the number started in Cambridge with the carrier shown. If it isn't, check the Massachusetts page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 508-878 | AT&T Mobility | Mobile carrier | – |
| 617-201 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 617-216 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-218 | Tc Systems | Phone company | – |
| 617-225 | Verizon (local phone) | Local phone company | – |
| 617-229 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-230 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-233 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-234 | Verizon (local phone) | Local phone company | – |
| 617-245 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-250 | Tc Systems | Phone company | – |
| 617-251 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 617-252 | Verizon (local phone) | Local phone company | – |
| 617-253 | Verizon (local phone) | Local phone company | – |
| 617-256 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-258 | Verizon (local phone) | Local phone company | – |
| 617-280 | Nep | Phone company | 2003 |
| 617-290 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-299 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-300 | Tc Systems | Phone company | – |
| 617-301 | AT&T Mobility | Mobile carrier | 2004 |
| 617-308 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-324 | Verizon (local phone) | Local phone company | 2002 |
| 617-335 | AT&T Mobility | Mobile carrier | – |
| 617-339 | Verizon (local phone) | Local phone company | – |
| 617-349 | Verizon (local phone) | Local phone company | – |
| 617-354 | Verizon (local phone) | Local phone company | – |
| 617-359 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-374 | Verizon (local phone) | Local phone company | – |
| 617-384 | Verizon (local phone) | Local phone company | – |
| 617-386 | Tc Systems | Phone company | 2001 |
| 617-388 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-395 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-397 | Tc Systems | Phone company | – |
| 617-401 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-417 | AT&T Mobility | Mobile carrier | 2001 |
| 617-430 | Bandwidth | Internet / business phone carrier | – |
| 617-441 | Verizon (local phone) | Local phone company | – |
| 617-444 | Verizon (local phone) | Local phone company | – |
| 617-452 | Verizon (local phone) | Local phone company | – |
| 617-453 | Bandwidth | Internet / business phone carrier | – |
| 617-460 | AT&T Mobility | Mobile carrier | – |
| 617-465 | Bandwidth | Internet / business phone carrier | – |
| 617-468 | Bandwidth | Internet / business phone carrier | – |
| 617-475 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-491 | Verizon (local phone) | Local phone company | – |
| 617-492 | Verizon (local phone) | Local phone company | – |
| 617-493 | Verizon (local phone) | Local phone company | – |
| 617-494 | Verizon (local phone) | Local phone company | – |
| 617-495 | Verizon (local phone) | Local phone company | – |
| 617-496 | Verizon (local phone) | Local phone company | – |
| 617-497 | Verizon (local phone) | Local phone company | – |
| 617-498 | Verizon (local phone) | Local phone company | – |
| 617-499 | Verizon (local phone) | Local phone company | – |
| 617-500 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-503 | Verizon (local phone) | Local phone company | – |
| 617-520 | Verizon (local phone) | Local phone company | – |
| 617-528 | Tc Systems | Phone company | – |
| 617-540 | Verizon (local phone) | Local phone company | – |
| 617-547 | Verizon (local phone) | Local phone company | – |
| 617-551 | Verizon (local phone) | Local phone company | – |
| 617-575 | Verizon (local phone) | Local phone company | – |
| 617-576 | Verizon (local phone) | Local phone company | – |
| 617-577 | Verizon (local phone) | Local phone company | – |
| 617-583 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-588 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-599 | Verizon (local phone) | Local phone company | 2001 |
| 617-613 | Tc Systems | Phone company | – |
| 617-621 | Verizon (local phone) | Local phone company | – |
| 617-642 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-647 | American Messaging Services | Paging service | – |
| 617-649 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-661 | Verizon (local phone) | Local phone company | – |
| 617-665 | Verizon (local phone) | Local phone company | – |
| 617-674 | Tpx Communications | Internet / business phone carrier | – |
| 617-679 | Verizon (local phone) | Local phone company | – |
| 617-682 | Ymax Communications | Phone company | – |
| 617-685 | MCImetro (Verizon Business) | Internet / business phone carrier | 2018 |
| 617-693 | Onvoy | Internet / business phone carrier | – |
| 617-703 | American Messaging Services | Paging service | – |
| 617-710 | AT&T Mobility | Mobile carrier | – |
| 617-714 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-715 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-758 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-761 | Verizon (local phone) | Local phone company | – |
| 617-768 | Verizon (local phone) | Local phone company | – |
| 617-798 | Bandwidth | Internet / business phone carrier | – |
| 617-800 | Rcn Telecom Services | Phone company | – |
| 617-802 | Verizon (local phone) | Local phone company | – |
| 617-803 | AT&T Mobility | Mobile carrier | – |
| 617-806 | Verizon (local phone) | Local phone company | – |
| 617-812 | Onvoy | Internet / business phone carrier | – |
| 617-821 | T-Mobile (including Sprint) | Mobile carrier | – |
| 617-836 | Norfolk County Internet | Phone company | – |
| 617-844 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-852 | AT&T Mobility | Mobile carrier | – |
| 617-864 | Verizon (local phone) | Local phone company | – |
| 617-866 | Verizon (local phone) | Local phone company | – |
| 617-868 | Verizon (local phone) | Local phone company | – |
| 617-871 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-873 | Verizon (local phone) | Local phone company | – |
| 617-876 | Verizon (local phone) | Local phone company | – |
| 617-899 | AT&T Mobility | Mobile carrier | – |
| 617-902 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-909 | AT&T Mobility | Mobile carrier | – |
| 617-914 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-945 | Comcast | Internet / business phone carrier | – |
| 617-949 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-955 | AT&T Mobility | Mobile carrier | 2005 |
| 617-995 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-998 | Verizon (local phone) | Local phone company | 2001 |
| 617-999 | Verizon Wireless | Mobile carrier | – |
| 857-209 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 857-235 | Verizon (local phone) | Local phone company | 2008 |
| 857-242 | Tpx Communications | Internet / business phone carrier | 2011 |
| 857-253 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 857-259 | AT&T Mobility | Mobile carrier | 2011 |
| 857-270 | Verizon Wireless | Mobile carrier | 2014 |
| 857-285 | Windstream (PAETEC) | Internet / business phone carrier | 2012 |
| 857-298 | Onvoy | Internet / business phone carrier | 2017 |
| 857-320 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 857-331 | Verizon Wireless | Mobile carrier | 2015 |
| 857-357 | Megaphone | Phone company | 2019 |
| 857-412 | Onvoy | Internet / business phone carrier | – |
| 857-420 | Onvoy | Internet / business phone carrier | 2022 |
| 857-434 | Shelcomm | Phone company | 2026 |
| 857-500 | Verizon Wireless | Mobile carrier | 2011 |
| 857-529 | Verizon Wireless | Mobile carrier | 2015 |
| 857-600 | Bandwidth | Internet / business phone carrier | 2011 |
| 857-639 | TON80 Communications | Internet / business phone carrier | 2022 |
| 857-706 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 857-756 | Mettel | Phone company | 2005 |
| 857-757 | The Voice Application Network | Phone company | 2015 |
| 857-777 | Peerless Network Of Massachusetts | Internet / business phone carrier | 2012 |
| 857-799 | Hd Carrier | Internet / business phone carrier | 2018 |
| 857-829 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 857-856 | Onvoy | Internet / business phone carrier | 2015 |
| 857-928 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 857-998 | Verizon Wireless | Mobile carrier | 2001 |
| 857-999 | Peerless Network Of Massachusetts | Internet / business phone carrier | 2012 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.