Phone numbers in Big Rock, Illinois
Big Rock has 8 phone prefixes in area codes 331, 630.
Biggest holders: Level 3 (Lumen), Bandwidth, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 12%
- Internet / business phone carrier 75%
- Phone company 12%
Every prefix in Big Rock
Search the first six digits of a number in this list. If it's here, the number started in Big Rock with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-310 | Bandwidth | Internet / business phone carrier | 2014 |
| 331-850 | Onvoy | Internet / business phone carrier | 2021 |
| 630-216 | Rcn Telecom Services Of Illinios | Phone company | – |
| 630-318 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-556 | AT&T (local phone) | Local phone company | – |
| 630-733 | Teleport Communications America | Internet / business phone carrier | 2001 |
| 630-884 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-982 | 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.