Phone numbers in Glenrock, Wyoming
Glenrock has 4 phone prefixes in area code 307.
Biggest holders: AT&T Mobility, CenturyLink / Lumen, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 50%
- Internet / business phone carrier 25%
Every prefix in Glenrock
Search the first six digits of a number in this list. If it's here, the number started in Glenrock with the carrier shown. If it isn't, check the Wyoming page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 307-309 | AT&T Mobility | Mobile carrier | 2006 |
| 307-436 | CenturyLink / Lumen | Local phone company | – |
| 307-554 | Onvoy | Internet / business phone carrier | – |
| 307-741 | Union Telephone | Local phone company | 2002 |
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.