Phone numbers in Olney, Illinois
Olney has 28 phone prefixes in area codes 618, 730.
Biggest holders: AT&T Mobility, Onvoy, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 39%
- Local phone company 11%
- Internet / business phone carrier 39%
- Phone company 11%
Every prefix in Olney
Search the first six digits of a number in this list. If it's here, the number started in Olney with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 618-320 | AT&T Mobility | Mobile carrier | 2014 |
| 618-354 | Skyetel | Internet / business phone carrier | – |
| 618-388 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 618-392 | Frontier | Local phone company | – |
| 618-393 | Frontier | Local phone company | – |
| 618-395 | Frontier | Local phone company | – |
| 618-429 | Mcc Network Services | Phone company | 2009 |
| 618-517 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 618-617 | Onvoy | Internet / business phone carrier | 2019 |
| 618-730 | Onvoy | Internet / business phone carrier | 2023 |
| 618-837 | AT&T Mobility | Mobile carrier | – |
| 618-838 | AT&T Mobility | Mobile carrier | – |
| 618-839 | AT&T Mobility | Mobile carrier | – |
| 618-843 | AT&T Mobility | Mobile carrier | – |
| 618-879 | Nuso | Internet / business phone carrier | 2001 |
| 618-902 | Onvoy | Internet / business phone carrier | 2021 |
| 730-228 | IP Horizon | Internet / business phone carrier | 2023 |
| 730-238 | Onvoy | Internet / business phone carrier | 2024 |
| 730-249 | AT&T Mobility | Mobile carrier | 2024 |
| 730-257 | AT&T Mobility | Mobile carrier | 2024 |
| 730-259 | AT&T Mobility | Mobile carrier | 2024 |
| 730-268 | AT&T Mobility | Mobile carrier | 2025 |
| 730-269 | Nuso | Internet / business phone carrier | 2025 |
| 730-277 | Wavenation | Phone company | 2025 |
| 730-279 | Bandwidth | Internet / business phone carrier | 2025 |
| 730-303 | AT&T Mobility | Mobile carrier | 2026 |
| 730-305 | Peerless Network Of Illinois | Internet / business phone carrier | 2026 |
| 730-587 | Exiant Communications | Phone company | 2026 |
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.