Phone numbers in Vandalia, Illinois
Vandalia has 5 phone prefixes in area code 618.
Biggest holders: AT&T (local phone), Onvoy, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 20%
- Internet / business phone carrier 40%
Every prefix in Vandalia
Search the first six digits of a number in this list. If it's here, the number started in Vandalia with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 618-283 | AT&T (local phone) | Local phone company | – |
| 618-431 | Onvoy | Internet / business phone carrier | – |
| 618-699 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 618-704 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 618-725 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
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.