Phone numbers in Forrest, Illinois
Forrest has 8 phone prefixes in area codes 779, 815.
Biggest holders: IP Horizon, AT&T Enterprises, Ahoi. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 12%
- Internet / business phone carrier 62%
- Phone company 25%
Every prefix in Forrest
Search the first six digits of a number in this list. If it's here, the number started in Forrest with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-298 | IP Horizon | Internet / business phone carrier | 2020 |
| 779-425 | AT&T Enterprises | Phone company | 2025 |
| 779-452 | Ahoi | Phone company | 2026 |
| 779-739 | Twilio | Internet / business phone carrier | 2022 |
| 779-855 | Terra Nova Telecom | Internet / business phone carrier | 2021 |
| 779-885 | 8X8 | Internet / business phone carrier | 2026 |
| 779-990 | Commio | Internet / business phone carrier | 2021 |
| 815-657 | AT&T (local phone) | Local phone company | – |
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.