Phone numbers in Dover, New Hampshire
Dover has 29 phone prefixes in area code 603.
Biggest holders: AT&T Mobility, Consolidated Comm Of No. New England-nh, Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 38%
- Local phone company 17%
- Internet / business phone carrier 34%
- Paging service 3%
- Phone company 7%
Every prefix in Dover
Search the first six digits of a number in this list. If it's here, the number started in Dover with the carrier shown. If it isn't, check the New Hampshire page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 603-241 | AT&T Mobility | Mobile carrier | 2022 |
| 603-248 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-285 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 603-312 | Bell Atlantic Mobile | Mobile carrier | – |
| 603-343 | Comcast | Internet / business phone carrier | – |
| 603-376 | American Messaging Services | Paging service | – |
| 603-457 | Idt America | Internet / business phone carrier | 2020 |
| 603-516 | Freedom Ring Communications | Phone company | – |
| 603-534 | Bell Atlantic Mobile | Mobile carrier | – |
| 603-550 | Telnyx | Internet / business phone carrier | – |
| 603-605 | Peerless Network Of New Hampshire | Internet / business phone carrier | – |
| 603-609 | AT&T Mobility | Mobile carrier | – |
| 603-617 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 603-697 | Comcast | Internet / business phone carrier | 2022 |
| 603-740 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-742 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-743 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-749 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-750 | Fidium Enterprise Services | Phone company | – |
| 603-767 | AT&T Mobility | Mobile carrier | – |
| 603-781 | AT&T Mobility | Mobile carrier | – |
| 603-804 | Boost / Virgin Mobile | Mobile carrier | 2023 |
| 603-817 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 603-834 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 603-842 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 603-866 | T-Mobile (including Sprint) | Mobile carrier | – |
| 603-953 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 603-970 | AT&T Mobility | Mobile carrier | 2006 |
| 603-978 | AT&T Mobility | Mobile carrier | 2001 |
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.