Phone numbers in Warren, Rhode Island
Warren has 13 phone prefixes in area code 401.
Biggest holders: Verizon (local phone), Onvoy, Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 8%
- Local phone company 23%
- Internet / business phone carrier 69%
Every prefix in Warren
Search the first six digits of a number in this list. If it's here, the number started in Warren with the carrier shown. If it isn't, check the Rhode Island page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 401-237 | Teleport Communications America | Internet / business phone carrier | – |
| 401-245 | Verizon (local phone) | Local phone company | – |
| 401-246 | Verizon (local phone) | Local phone company | – |
| 401-247 | Verizon (local phone) | Local phone company | – |
| 401-252 | MetroPCS (T-Mobile) | Mobile carrier | 2002 |
| 401-289 | Comcast | Internet / business phone carrier | – |
| 401-303 | Onvoy | Internet / business phone carrier | – |
| 401-310 | Bandwidth | Internet / business phone carrier | – |
| 401-337 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 401-561 | Onvoy | Internet / business phone carrier | – |
| 401-628 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 401-694 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 401-903 | Level 3 (Lumen) | Internet / business phone carrier | – |
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.